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18 November, 09:11

4a+6b=10

2a-4b=12

what does 12a = ?

+1
Answers (1)
  1. 18 November, 12:14
    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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