Solving systems using substitution and linear equations?

2x+y=-1

y=3x-16

How would I do then substitution?

2 Answers

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  • 8 years ago
    Favorite Answer

    first solve for y in the first equation

    y=-2x-1

    Now plug in this value of y in the first equation into the second equation

    3x-16=-2x-1

    -15=x

    Now plug in this value of x into one of the equations

    2(-15)+y=-1

    -30+y=-1

    y=29

  • Fred
    Lv 7
    8 years ago

    Solve your 1st eqn for y. y = -1 -2x. Now substitute that value of y into your 2nd eqn.

    -1-2x = 3x-16. Solve for x. Now that you have x put that back in either eqn to find y. Cake. :)

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