Mon Prof Augmenté
Straight Line on Axes
A straight line crosses a grid with a vertical and a horizontal axis. Its steepness and where it cuts the axes describe how the line behaves.
This picture is part of the full library
Every lesson is open to everyone for 7 days after it is published. This one came out on September 14, 2026: its text stays readable here, and its picture opens with a subscription.
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Age 15: open this week
Browse Age 15
In the picture
- The y-intercept: the point where the line crosses the vertical axis.
- The x-intercept: the point where the line crosses the horizontal axis.
- Another point on the line, used to check its direction.
- The slope triangle: the rise over the run between two points on the line.
Examples
- A phone plan with a fixed monthly fee plus a charge for each gigabyte used.
- A walk at a steady speed, where distance increases by the same amount each minute.
Key takeaways
- The slope tells how much y changes when x increases by 1.
- The y-intercept is the value of y when x is 0.
Carry on in the app
Three questions on this lesson. It has left the free week, so its quiz is for subscribers.
At least one new illustrated lesson every weekday for your child’s year, with its quiz and a reminder at 6:15 pm.
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