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5 July, 00:53

What is - 5x+2y=9

y=7x

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Answers (2)
  1. 5 July, 01:01
    0
    Step-by-step explanation:

    -5x+2y=9

    y=7x

    Since you know what y is relative to x, you can plug it into the formula to find your answer.

    -5x+2 (7x) = 9

    14x-5x=9

    x=1

    y=7
  2. 5 July, 01:16
    0
    x=1, y = 7

    Step-by-step explanation:

    -5x+2y=9

    y=7x

    Substitute the second equation in for the first

    -5x + 2 (7x) = 9

    -5x + 14x = 9

    Combine like terms

    9x = 9

    Divide by 9

    9x/9 = 9/9

    x = 1

    Now find y

    y = 7 (1)

    y = 7
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