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21 February, 05:11

What's the solution of the system?

7x+5y=19

-7x-2y=-16

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Answers (1)
  1. 21 February, 05:35
    0
    Add them equations, y's cancel

    7x+5y=19

    -7x-2y=-16 +

    0x+3y=3

    3y=3

    divide by 3

    y=1

    sub back

    7x+5y=19

    7x+5 (1) = 19

    7x+5=19

    minus 5 both sides

    7x=14

    divide by 7

    x=2

    (x, y)

    (2,1)

    solution is (2,1)
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