f(x)=5x + 20\nclick to select points on the graph.

Explanation:

Step1: Substitute x = -6

$f(-6)=5\times(-6)+20=-30 + 20=-10$

Step2: Substitute x = -4

$f(-4)=5\times(-4)+20=-20 + 20=0$

Step3: Substitute x = -2

$f(-2)=5\times(-2)+20=-10 + 20=10$

Answer:

When $x=-6$, $f(x)=-10$; when $x = -4$, $f(x)=0$; when $x=-2$, $f(x)=10$