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Substitution method to solve system of equations

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y - 2x = -5
3y - x = 5

Please help me out.

  • Substitution method to solve system of equations - ,

    change to first equation to
    y = 2x - 5

    now sub that into the second one

    3y - x = 5
    3(2x-5) - x = 5
    6x - 15 - x = 5
    5x = 20
    x = 4

    now put that value of x into y = 2x - 5
    y = 2(4) - 5
    = 8-5
    = 3

    check in
    #1 : 3 - 8 = -5 checks!
    #2 : 9 - 4 = 5 checks!

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