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7 August, 05:48

Solve the system r + s = - 12

4R - 6s = 12

A. - 4,-8

B - 6,-6

C - 4,8

D Infinitely many solutions

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Answers (1)
  1. 7 August, 08:46
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    r + s = - 12 so r = - s - 12

    4r - 6s = 12

    substitute r = - s - 12 into 4r - 6s = 12

    4r - 6s = 12

    4 (-s - 12) - 6s = 12

    -4s - 48 - 6s = 12

    -10s = 60

    s = - 6

    r = - (-6) - 12

    r = 6 - 12

    r = - 6

    answer

    B - 6,-6
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