Posted by lovey on Sunday, February 21, 2010 at 12:51am.
Solve the linear equation using any technique you have learned. Name the technique. Check.
3x + 12 = 7x  28
I know the answer is x = 4
and I know that substitution is the technique that is used, but I can't figure out how to set this up

algebra  Marie, Sunday, February 21, 2010 at 1:09am
3(4) + 12 = 7(4)  28
12 + 12 = 28  28
0 = 0

algebra  Reiny, Sunday, February 21, 2010 at 7:44am
3x + 12 = 7x  28
Add 7x to both sides
3x + 12 + 7x = 7x  28 + 7x
10x + 12 = 28
Now subtract 12 from both sides
10x + 12  12 = 28  12
10x = 40
now divide both terms by 10
x = 4
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