slope is change in y over change in x
use 2 points from the table so -3,-21 and -6,-39
change in Y: -39 - -21 = -18
change in x = -6 - -3 = -3
slope = -18/-3 = 6
slope = 6
Expand
12x - 48 + 4x + 28
Collect like terms
(12x + 4x) + (-48 + 28)
Simplify
<u>16x - 20</u>
