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gr.10 math

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solve the linear system using substitution. please show me the steps!:)

x-y=-5
2x-y=-7

  • gr.10 math - ,

    arrange the first equation to x = y-5

    sub replace the x in the second equation with that expression

    2x-y=-7
    2(y-5) - y = -7
    2y - 10 - y = -7
    y = -7 + 10
    y = 3 , now let's put that back into x = y-5
    x = 3 - 5
    x = -2

    so x = -2, y = 3

    check in the first:
    is -2 - (3) = -5 ? , yes!
    in the second:
    is 2(-2) - (3) = -7 ? , yes!

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