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12 September, 20:13

For the following system, if you isolated x in the second equation to use the substitution method, what expression would you substitute into the first equation?

3x + y = 8

-x - 2y = - 10

A.) - 2y + 10

B.) 2y + 10

C.) 2y - 10

D.) - 2y - 10

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Answers (1)
  1. 12 September, 23:04
    0
    A.) - 2y + 10

    Step-by-step explanation:

    -x - 2y = - 10

    Add 2y to both sides.

    -x = 2y - 10

    Multiply both sides by - 1.

    x = - 2y + 10
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