Straight-line graph calculator: y = mx + c

Move two points to see the line through them, its gradient as rise over run, the y-intercept and the equation y = mx + c, plus the distance and midpoint.

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Questions students ask

How do you find the gradient between two points?

m = (y₂ − y₁)/(x₂ − x₁): the change in y divided by the change in x.

What is the gradient of a perpendicular line?

The negative reciprocal, −1/m. The two gradients multiply to −1.

Free notes on straight line graphs

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