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27 November, 00:34

Solve the system of the linear equation by adding or subtracting.

7x - y = 9

7x + 2y = 24

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Answers (1)
  1. 27 November, 00:37
    0
    First equation by - 1 and add to 2nd equaton

    -7x+y=-9

    7x+2y=24 +

    0x+3y=15

    3y=15

    divide by 3 both sides

    y=5

    sub back

    7x-y=9

    7x-5=9

    add 5 both sides

    7x=14

    divide by 7 both sides

    x=2

    x=2

    y=5

    (2,5)
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