Answer:
13.75
Step-by-step explanation:
3b + d = 8.75
2b + 2d = 7.50
(3b + d = 8.75) times 2
(2b + 2d = 7.50) times -3
6b + 2d = 17.5
-6b + (-6d) = -22.5
the b's cancel out, 2d - 6d = -4d and 17.5 - 22.5 = -5
-4d = -5 Divide it and d = 1.25
then plug in 1.25 for d.
2b + 2(1.25) = 7.50
2b + 2.5 = 7.50
2b = 5
b= 2.5
3(2.5) + 1.25 = 8.75 ? Yes.
2(2.5) + 2(1.25) = 7.50 ? Yes.
4(2.5) + 3(1.25) = 13.75.
