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25 January, 12:36

How do u do 2x-y=17

X-y=10

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Answers (2)
  1. 25 January, 13:55
    0
    Another way to do it is

    2x-y=17

    x-y=10, x=10+y

    substitute x=10+y for x in 2x-y=17 and get

    2 (10+y) - y=17

    20+2y-y=17

    20+y=17

    subtract 20 from both sides

    y=-3

    subsitute y=-3 into equation x-y=10

    x - (-3) = 10

    x+3=10

    subtract 3 from both sides

    x=7

    or subsitute into 2x-y=17

    2x - (-3) = 17

    2x+3=17

    subtract 3 from both sides

    2x=14

    divide both sides by two

    x=7
  2. 25 January, 14:32
    0
    Multiply (x-y=10) by - 2. You will get - 2x+2y=-20. then multiply by 1 2x-y=17 that give u the same thing. Cross out the - 2x and 2x then subtract 2y by y which will leave u with y and subtract - 20 by 17 that will leave with - 3. So y = - 3
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