5x+3y=18 and 3x-3y=15 solve for y and x using elimination method

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5x+3y=18 and 3x-3y=15 solve for y and x using elimination method

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Edana Edana 4 years 2021-09-02T08:21:12+00:00 1 Answers 14 views 0

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  1. Helga
    0
    2021-09-02T08:22:32+00:00
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    Answer:

    x = 4.125 or 4\frac{1}{8}

    y = -0.875 or -\frac{7}{8}

    Step-by-step explanation:

    5x + 3y = 18

    3x – 3y = 15

    3y and -3y can be cancled out becuase + and – cancel out and they both have 3y in them. We don’t have to switch any signs in this case. You can just add them all exept 3y and -3y becuase they will be canceled out.

    8x = 33

    x = 4.125

    Now we know what x is. We need to figure out what y is now. To figure out y chose an equation from the problem and plug in the x value. Lets chose 3x – 3y = 15.

    3(4.125) – 3y = 15

    12.375 – 3y = 15

    -3y = 2.625

    y = -0.875

    Now we know what y is.  I hope this helps 🙂

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