Question

the value of y varies directly with x, and y = 20 when x = -4. what is y when x = -8? y = ? remember: y = kx

Explanation:

Step1: Find constant k

Substitute $y=20, x=-4$ into $y=kx$:
$20 = k(-4)$
Solve for k: $k = \frac{20}{-4} = -5$

Step2: Find y when x=-8

Use $y = -5x$, substitute $x=-8$:
$y = -5(-8)$

Answer:

40