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Here you will learn about the x and y axis, including what it is and how to use it to create the scales for a graph.
Students will first learn about the x and y axis as part of geometry in 5th grade. This knowledge will be expanded upon in statistics and probability in 6th grade.
Every week, we teach lessons on the x and y axis to students in schools and districts across the US as part of our online one-on-one math tutoring programs. On this page we’ve broken down everything we’ve learnt about teaching this topic effectively.
The x and y axis are axes in the Cartesian coordinate system.
They are two perpendicular lines that form a coordinate plane (coordinate grid), where the location of a point on the plane can be represented as a coordinate of the form (x,y) .
The x -axis is a horizontal line (left to right).
The y -axis is a vertical line (up and down).
The x -axis and y -axis intersect at the origin (0,0) .
Here is an example of the first quadrant of the coordinate plane:
It is important to remember that the x and y axes can be adjusted to have any scale.
This is particularly important when graphing bar graphs, line graphs, histograms and other numerical data sets.
For example,
Total hours | 1 | 2 | 3 | 4 |
Pages read | 15 | 30 | 45 | 60 |
The y -axis is labeled βpages read,β since it is the dependent variable.
This is because the pages read depends on how many hours have been spent reading.
On the y -axis, every two units are labeled as 10 . This means each individual unit is 5 .
The x -axis is labeled βtotal hours,β since it is the independent variable.
The hours range from 1 to 4 .
On the x -axis, every five units are labeled as 1 .
That means each individual unit is 0.2 .
How does this relate to 5 th grade math and 6 th grade math?
In order to use the x and y axis:
Use this worksheet to check your 5th to 8th grade studentsβ understanding of the
Use this worksheet to check your 5th to 8th grade studentsβ understanding of the
Construct a bar graph axis for the following data.
Movie genre | # of movies |
---|---|
Horror | 3 |
Action | 7 |
Romance | 4 |
Comedy | 9 |
Other | 1 |
Since the data is categorical, the x -axis will have the names of the Movie genre.
Remember, a bar graph must have gaps between each bar when representing categorical data.
2Use the data given to write the range of values for the \textbf{y} -axis.
The y -axis should have the number of movies on it. The number of movies range from 1 to 9 .
The graph has 20 units from the origin to the top, so you can start the axis at 0 and label every 2 units as a multiple of 1 .
*Note, if you had labeled each unit as a multiple of 1 , the y -axis would have gone from 0 to 20 . Since the largest data point is 9 , this would leave too much empty space on the graph.
3Label each axis.
Construct a bar graph axis for the following data.
Number of customers | Frequency |
---|---|
0-4 | 1 |
5-9 | 6 |
10-14 | 14 |
15-19 | 9 |
20-24 | 1 |
Use the data given to write the range of values/categories for the \textbf{x} -axis.
The x -axis will represent the number of customers. The numerical data is grouped, but because it is discrete data, (you cannot have 4.2 customers), we should treat these groups as categories. There are 6 categories, we can use three squares width per category and one square gap in between.
Use the data given to write the range of values/categories for the \textbf{y} -axis.
The data range is from 1 to 14 for the frequency values and there are 16 square units given on the y -axis.
It is appropriate again to use a scale of 1 unit per square, but write the value for every multiple of 2 so that the axis is not overcrowded.
Label each axis.
Construct a histogram axis for the following data.
Money spent ($) | Frequency |
---|---|
0 \leq \$ < 10 | 2 |
10 \leq \$ < 20 | 6 |
20 \leq \$ < 30 | 1 |
30 \leq \$ < 40 | 8 |
40 \leq \$ < 50 | 3 |
50 \leq \$ < 60 | 7 |
Use the data given to write the range of values/categories for the \textbf{x} -axis.
The values for the x -axis here represent money spent (\$). The range of values is therefore 0 to 60, and each bin is a multiple of 10 .
Since there are 30 units from 0 on the x -axis, each unit can represent 2 . To avoid crowding and show the multiples of 10 , label every 5 units.
Use the data given to write the range of values/categories for the \textbf{y} -axis.
The height of the bar shows the frequency, so the y -axis needs to represent the frequency values.
Since the frequency values range from 1 and 8 and there are 16 square units on the y -axis, let each unit be a half, so that every other 1 is labeled as the next whole.
Label each axis.
Construct a histogram axis for the following data.
Total time | Frequency |
---|---|
0 \leq t < 2 | 20 |
2 \leq t < 4 | 32 |
4 \leq t < 6 | 28 |
6\leq t < 8 | 19 |
Use the data given to write the range of values/categories for the \textbf{x} -axis.
The values for the x -axis here represent the total time. The range of values is therefore 0 to 8 .
Each unit on the x -axis can represent 1 since there are 10 square units on the x -axis.
Use the data given to write the range of values/categories for the \textbf{y} -axis.
The height of the bar shows the frequency, so the y -axis needs to represent the frequency values.
Since the frequency values range from 19 and 32 , let each unit be 4 , so that the last value is 32 .
Label each axis.
Construct a set of axes for a scatter graph to represent the following data.
Umbrellas sold | 1 | 10 | 25 | 0 | 1 | 32 | 47 | 8 | 15 |
Rainfall (mm) | 3 | 2 | 4 | 0 | 0 | 5 | 6 | 1 | 1 |
Use the data given to write the range of values/categories for the \textbf{x} -axis.
The x -axis of a scatter graph should always have the independent variable plotted on it; in this case rainfall (mm) .
The range of values is between 0 and 6 \, mm, so the values should be spread out but still remain equally spaced.
Remember that 0 is labeled at the intersection of the two axes.
Use the data given to write the range of values/categories for the \textbf{y} -axis.
The y -axis should always have the dependent variable (the value that changes dependent on the rainfall) plotted. Here, this is the number of umbrellas sold.
As the values for umbrellas sold ranges from 0 to 47 , you can label the axis in equal increments of 5 , up to the value of 50 .
Label each axis.
Construct a set of axes for a line graph axis to represent the following set of data:
Quarter year | 1
(2005) | 2
(2005) | 3
(2005) | 4
(2005) | 1
(2006) | 2
(2006) | 3
(2006) | 4
(2006) |
Visitors (thousands) | 14 | 24 | 9 | 8 | 12 | 22 | 11 | 7 |
Use the data given to write the range of values/categories for the \textbf{x} -axis.
The x -axis for a line graph (time series graph) is always labeled as the time increment. Here, you need to write the 2 years (2005 and 2006) , divided into 4 quarters.
This means that you need at least 8 tick marks on the x -axis, equally spaced, labeled as: 1, 2, 3, 4, 1, 2, 3, and 4 . State the year below each group of four quarters.
Use the data given to write the range of values/categories for the \textbf{y} -axis.
The values for the number of visitors (thousands) range from 7 to 24 , so introduce a small break on the y -axis, start the values at 6 , and go up in equal increments of 2 , up to 24 .
The height of each square can represent 1,000 people (remember, the scale is in thousands).
Label each axis.
1. Using this table of values, select the most appropriate scale to use for the y -axis on the grid provided.
0 \, – \, 100Β increasing in multiples of 10
0 \, – \, 20Β increasing in multiples of 1
0 \, – \, 10Β increasing in multiples of 0.5
0 \, – \, 30 \, increasing in multiples of 5
The x -axis for this data will have the number of people plotted on it.
The range of data is from 1 to 17, so an appropriate scale is to increase in multiples of 1 .
2. Using this table of values, select the most appropriate scale or labelling to use for the x -axis on the grid provided.
0 \, – \, 24 using multiples of 2
0 \, – \, 100 increasing in multiples of 10
Categories of 0-4, \, 5-9, \, 10-14, \, 15-19, \, 20-24, with one square gap in between.
4 \, – \, 24 increasing in multiples of 10
The x -axis, for this data, will have the number of customers plotted on it.
The range of data is from 0 to 24 so an appropriate scale is to increase in multiples of 2.
3. Using this table of values, select the appropriate scale to use on the y -axis.
0 \, – \, 24 increasing in multiples of 2
0 \, – \, 100 increasing in multiples of 10
0 \, – \, 16 increasing in multiples of 1
1 \, – \, 14 increasing in multiples of 0.5
The range of data for the frequency is from 1 to 14 so an appropriate scale is to increase in multiples of 1 for each square, so two squares would be labeled as a multiple of 2 .
4. For this table of values, what is the best scale to use for the x -axis?
0 \, – \, 14 increasing in multiples of 4
0 \, – \, 22.5 increasing in multiples of 0.5
0 \, – \, 28 increasing in multiples of 2
0 \, – \, 25 increasing in multiples of 1
The range of the data for the test score is between 0 and 25 , so it is suitable to write an axis from 0 to 28 and increase in multiples of 2 .
5. The table below shows the number of miles traveled after a certain number of hours. Which of the following graphs shows the appropriate x and y axis for the data set?
Time is the independent variable, so it is on the x -axis.
The time ranges from 1 to 4 hours, so using every 2 units as 1 hour shows the values 1 to 5 on the graph.
The y -axis is the dependent variable, total miles traveled, which ranges from 40 to 160 .
Since there are 10 units on the y -axis, going up by 20 each time shows the values 0-200.
These scales on the x and y axis will leave little empty space because they are appropriate for the data set.
6. The table below shows the number of strides and the time taken in seconds to run 100 {~m} . Which of the following four sets of axes would allow for an accurate scatter plot for the data set in the table below?
Time should be on the x -axis and so the Number of strides will be on the y -axis.
Each axis can have a break as this is a scatter graph and there is no data for values close to zero.
Each value must appear in the plotting area, and the scales should allow each point to be plotted with a suitable degree of accuracy.
Yes, being able to recognize the x and y axis and their scales is important when finding the slope of a line or the slope intercept, and it is also useful when graphing a linear equation.
Yes, this page overviews examples from Quadrant 1 only – which is positive numbers, but there are quadrants where negative numbers can be graphed.
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