Posted by Stacie on Monday, April 27, 2009 at 5:59pm.
none of your equation answers are correct.
I will #3 for you then follow the same method to do the rest
sub the first into the second:
x + 2(x+7) = -21
x + 2x + 14 = -21
3x = -35
x = -35/3
now sub that back into the first
y = -35/3 + 7 = -35/3 + 21/3 = -14/3
LS = y = -14/3
RS = x+7 = -35/3 + 7 = -14/3
LS = x+2y = -35/3 + 2(-14/3) = -21
RS = -21
now work each one out the same way, and check your answer the same way.
If you know how to do this substitution let me know but if you don't that's okay. Also, the last one I redid I got 52:30
x-2y=-1 -x+5y=4 x=-1 y=1
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