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In the Common Core, slope and the equation y = mx + b are grade 8 work. Start with two points, where the slope is worked out from the numbers. Then read it from a graph, graph lines from their equations, and write the equation of a line from its graph.

How to find a slope

The slope is the change in y over the change in x. For (2, 3) and (6, 11), it is (11 − 3) ÷ (6 − 2) = 8/4 = 2. Take both differences in the same order, second point minus first; the other order gives the same slope. On a graph, count the rise, up positive and down negative, then the run to the right. A horizontal line has a slope of 0. A vertical line’s slope is not defined, because its run is 0 and no number can be divided by 0.

Slope-intercept form

In y = mx + b, m is the slope and b is the y-intercept, where the line crosses the y-axis. To graph y = 2/3x − 1, plot (0, −1), go 3 right and 2 up to (3, 1), and draw the line through both points.

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