SOLUTION: 12x+6y=120 4x+y=30

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Question 952455: 12x+6y=120
4x+y=30
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

12x%2B6y=120....eq.1.....simplify;divide both sides by 3
4x%2By=30.......eq.2
---------------------------
4x%2B2y=40....eq.1
4x%2By=30.......eq.2
------------------------------subtract
4x%2B2y-4x-y=40-30
2y-y=10
highlight%28y=10%29
go to 4x%2By=30.......eq.2, substitute 10 for y and solve for x
4x%2B10=30
4x=30-10
4x=20
x=20%2F4
highlight%28x=5%29