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26 October, 08:49

2x+5y=20., - 2x+20y=-90. one solution. infinity many ir no solution. use elimination to find your answer

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  1. 26 October, 09:01
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    2x+5y=20

    X=10-2.5y

    -2 (10-2.5y) + 20y=-90

    -20+5y+20y=-90

    25y=-70

    Y=2.8

    2 (2.8) + 5y=20

    5.6+5y=20

    5y=14.4

    Y=2.88

    CHECK:

    2 (2.8) + 5 (2.88) = 20
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