algebra

1. What is the solution of the system?

4x + 3y = 12
7x + 5y = 26

A. (18, 20)
B. (18, -20)
C. (-20, 18)
D. (20, 18)

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  1. multiply first equation by 5
    and
    the second equation by 3
    20 x + 15 y = 60
    21 x + 15 y = 78
    ------------------subtract
    -1 x = - 18
    so
    x = 18
    now go back and find y

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