Answer
The slope is $m=-\displaystyle \frac{4}{3}$
We need more information to find b (the intercept).
Work Step by Step
Slope of the line $y=mx+b$ is defined as
$m=\displaystyle \frac{\Delta y}{\Delta x} =\displaystyle \frac{Rise}{Run}$,
If x increases by 3 units,
y will decrease by 4 units (as given by the text).
So, $\displaystyle \quad m=\frac{-4}{3}=-\frac{4}{3}$
We need more information to find b (the intercept).
For example, a point on the line.
