Answer
3
Work Step by Step
When we know two points on a given line, we can use the slope formula to calculate the slope of the line.
$m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$
Point 1: (-1,6)
Point 2: (0,9)
$m=\frac{9-6}{0-(-1)}=\frac{3}{1}=3$