Question

Find the solution to the system of equations 4m + 8n = 20 and -4m + 2n = -30.

=
O (7,-1)
O (7,1)
O (-7, -1)
O (-7, 1)

Answer 1

m=7, n=-1. (7, -1).

Explanation:

4m+8n=20

-4m+2n=-30

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10n=-10

n=-10/10

n=-1

4m+8(-1)=20

4m-8=20

4m=20+8

4m=28

m=28/4

m=7