Algebra 1: Common Core (15th Edition)

$y=-x-1$
We can see that the graph passes through the point $(-2,0)$ and the point $(0,-2)$. Let's use the formula to find the slope m given two points: $m=\frac{y_2-y_1}{x_2-x_1}=\frac{-2-0}{0-(-2)}=-1$ Use the slope and the coordinates to find b: $y=mx+b$ $-1=-1(0)+b$ $b=-1$ Now that we have the slope, we can use one of the points and plug these values into the point-slope equation, which is given by the formula: $y=mx+b$ $y=-1x+(-1)$ $y=-x-1$