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balu736 [363]
3 years ago
7

4a+6b=10 2a-4b=12 what does 12a =?

Mathematics
1 answer:
harina [27]3 years ago
8 0
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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