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12 October, 12:57

Solve using substitution

7x-9y=-9

X=-9

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Answers (1)
  1. 12 October, 13:11
    0
    y=6

    x=6.42

    Step-by-step explanation:

    7 (-9) + 9y=-9

    -63+9y=-9

    +63 + 63

    9y/9=54/9

    y=6

    7x-9 (6) = -9

    7x-54=-9

    +54 + 54

    7x/7=45/7

    x=6.42
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