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21 October, 16:44

Solve the system of equations using elimination.

15q - 4r = 62

5q + 8r = 86

A. q = - 7, r = - 6

B. q = 6, r = 7

C. q = - 7, r = - 7

D. q = 6, r = 6

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Answers (1)
  1. 21 October, 17:01
    0
    q = 6

    r = 7

    Step-by-step explanation:

    Multiply 1st column by - 2:

    -30q+8r=-124

    5q+8r=86

    Subtract 2nd column from the first column:

    -35q = - 210

    Solve for q:

    q=6

    Subtract q=6 by any of the two equations, so:

    -30q+8r=-124

    -30*6+8r=-124

    Solve for r:

    r=7
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