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9 August, 18:45

Solve the following systems of equations. express your answer as an ordered pair in (a. b) format, with no spaces between the numbers or symbols? 2x+5y=16 and - 5x-2y=2

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  1. 9 August, 22:16
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    I would do (x, y) format but ok

    2x+5y=16

    -5x-2y=2

    multiply 2nd equation by 2 and first by 5 and add them

    10x+25y=80

    -10x-4y=4 +

    0+21y=84

    21y=84

    divide both sides by 21

    y=4

    sub back

    2x+5y=16

    2x+5 (4) = 16

    2x+20=16

    minus 20 both sides

    2x=-4

    divide by 2

    x=-2

    (x, y)

    (-2,4)
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