March 28, 2017

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Solve the system of equations by Elimination OR Substitution. Explain why you chose one method over the other.

3x – 2y = 8
2x + 5y = -1

  • math - ,

    I would only use substitution if I can isolate one of the variables without having to go into fractions.

    In this case I would use elimination.
    multiply the first by 5 and the second by 2, then add them :

    15x - 10y = 40
    4x + 10y = -2

    19x = 38
    x = 2

    now sub that back into one of the originals. Take it from here.

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