4a+6b=10 2a-4b=12 what does 12a=
Asked by maham237 @ in Mathematics viewed by 400 People
Answered by maham237 @
1/2(4a + 6b = 10)
2a + 3b = 5
2a + 3b = 5
-) 2a - 4b = 12
7b = -7
b = -1
Substitute:
2a - 4(-1) = 12
2a + 4 = 12
2a = 8
a = 4
12a = 12(4) = 48
This is a little longer way to do it, but I think it's easier to understand
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