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1 August, 01:11

Which expression can you substitute in the indicated equation to solve the system below?

9y = 6 - x

12x = 5 - y

A. Substitute 5 - x for y in to 9y = 6 - x

B. Substitute 6 - 9y for x in to 12x = 5 - y

C. Substitute 5 + 12x for y in to 9y = 6 - x

D. Substitute 6 + 9y for x in to 12x = 5 - y

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Answers (1)
  1. 1 August, 01:37
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    B. Substitute 6 - 9y for x in to 12x = 5 - y

    Step-by-step explanation:

    From the first equation we solve for x and get

    x = 6 - 9y.

    and one way to solve the given system of equations is to put this value of x into the equation 12x = 5 - y. this will give us 12 (6 - 9y) = 5-y, which can be easily solved for y.

    Therefore choice B is the correct option.

    Let us go through other choices for the sake of completeness

    Choice A gives the wrong value of y for substitution.

    Choice C also gives the wrong value of y for substitution.

    Choice D gives the wrong value of x for substitution.
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