SOLUTION: Solve by substitution: Y=3x-12 6x+4y=15

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Question 701566: Solve by substitution:
Y=3x-12
6x+4y=15
Answer by mouk(232) About Me  (Show Source):
You can put this solution on YOUR website!
We have:
+6x%2B4y=15+ and +y=3x-12+

So:
+6x%2B4%283x-12%29=15+
+6x%2B12x-48=15+
+18x=63+
+x=3.5+

But +y=3x-12+ so:
+y=3%283.5%29-12+
+y=-1.5+