# MPM1D Slope and y-intercept; graphing 2016-05-10

We spent today working on reading the slope and y-intercept from equations for lines. In an equation like

$y = -\frac{3}{2}x+4$

the slope is $-\frac{3}{2}$ and the y-intercept is 4.

We practised plotting that y-intercept on a coordinate grid and then using the slope to “step” along the line, plotting other points that were also on the line. In the above example, we moved to the right 2 (the run) and down 3 (the rise; it’s down because the slope is negative).

Take a look at yesterday’s post for the a video explaining how this works.