Homework Help: Math 116

Posted by Katie A 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 - Reiny, 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 - Steve, 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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