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March 26, 2017

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Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this.
-5x – 7y = 25.5
-2x + 10y = -9

  • algebra - ,

    The plan is to get the coefficients of either the x's or the y's to be the same or opposite
    I will go for the x's to be the same ...
    1st equation times (-2) : --> 10x + 14y = -51
    2nd equation times (-5): --> 10x - 50y = 45
    subtract them ....
    64y = -96
    y = -96/64 = -3/2

    sub into original 2nd
    -2x + 10(-3/2) = -9
    -2x = -9 + 15 = 6
    x = -3

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