Posted by Megan on Monday, October 11, 2010 at 10:06pm.
X = Comp,
2x + 40 = supp,
1. A + X = 90,
A = 90 - X,
2. A + (2X + 40) = 180,
Substitute 90 - x for A:
(90 - X) + (2X + 40) = 180,
-X + 2X + 90 + 40 = 180,
X + 130 = 180,
X = 180 - 130,
X = 50,
Substitute 50 for x in Eq 1:
A + 50 = 90,
A = 90 - 50,
A = 40.