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29 August, 18:46

How to solve - 3x+8y=-18. (the bottom) 0=-10y-5x+30 using elimination?

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  1. 29 August, 20:30
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    -3x+8y=-18

    0=-10y-5x+30

    First move the 30 to the other side of the equal sign so you have the problum

    -3x+8y=-18

    -5x-10y=-30

    Now times the top problum by 5 and the bottom one by 3 to get the new problum

    -15x+40y=-90

    -15x-30y=90

    Now that you have a commen number in both problums you would subtract both of the problums.

    -70y=180

    Now that you have that divide the - 70 on both sides.

    y=2.57

    Now you would substitute the y for the 2.57 in one of the problums.

    -15x-30 (2.57) = 90

    Times the - 30 with the 2.57.

    -15x-77=90

    Now subtract the - 77 on both sides.

    -15x=13

    Now divide the - 15 on both sides to get your answer for x.

    x=.86

    Now thats your answers

    y=2.57

    x=.86

    (.86,2.57)
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