Answer
$m = -1$
Work Step by Step
We are given the two points X $(0, a)$ and Y $(-a, 2a)$.
Let's use the formula to find the slope $m$ given two points:
$m = \frac{y_2 - y_1}{x_2 - x_1}$,
where $(x_1, y_1)$ and $(x_2, y_2)$ are points on the line.
Let's plug in the values into this formula:
$m = \frac{2a - a}{-a - 0}$
Simplify the numerator and denominator:
$m = \frac{a}{-a}$
Divide both the numerator and denominator by their greatest common factor, $a$:
$m = -1$
