Answer
$(0,0)$ and $(1,-9)$
Work Step by Step
Let us find the slope of the line that passes through $(0,0)$ and $(1,-9)$ to prove that it is $-9$:
To find the slope, we use the formula $m=\frac{y_2-y_1}{x_2-x_1}$.
We plug in the $x$ and $y$ values: $m=\frac{-9-0}{1-0}$
We simplify above and below the fraction bar with subtraction: $m=\frac{-9}{1}$
Then, we divide the fraction: $m=-9$
Therefore, these two points lie on a line with slope $m=-9$.
