Y = kx
80 = 16k
k = 80/16 = 5
direct variation
The first 2 choices are corect
-4x-y+6
you needed to just add like terms
Area of rectange = 5 x 8 = 40
area of green triangle = 1/2(8)(1) = 4
area of yellow triangle = 1/2(4)(8) = 16
area of blue triangle = 40 - (4+16) = 40 - 20 = 20
answer
C. 20
