3 years ago

If 3x +4y = 7 and 2y = 6x + 6, then what is xy

1 answer:

4 0

3x + 12x + 12 = 7
15x + 12 = 7
15x = -5
x = 1/3

3 (1/3) + 4y = 7
1 + 4y = 7
4y = 6
y = 1.5

3 (1/3) + 4 (1.5) = 7

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