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Posted by on Thursday, September 29, 2011 at 10:40pm.

if I solve this by substitution
8x+7y=-13
x=29-7y
I end up with -3.8

But I think there is no solution

  • Math 116 - , Thursday, September 29, 2011 at 11:38pm

    sub the 2nd into the 1st

    8(29-7y) + 7y = -13
    232 - 56y + 7y = -13
    -49y = -245
    y = 245/49 = 5

    then x = 29 - 7(5) = -6

  • Math 116 - , Friday, September 30, 2011 at 11:32am

    You should have questioned your "no solution" answer, since the lines have different slopes. The have to intersect somewhere.

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