SOLUTION: solve by substitution method 3x + 8y = 4 12y +6x = -1

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Question 274912: solve by substitution method
3x + 8y = 4
12y +6x = -1
Answer by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
3x%2B8y=4
12y%2B6x=-1 x=%28-1-12y%29%2F6 x=%28-1%2F6%29-2y
plug x into the first equation
3x%2B8y=4
3%28%28-1%2F6%29-2y%29%2B8y=4
%28-1%2F2%29-6y%2B8y=4
%28-1%2F2%29%2B2y=4
2y=4%2B%281%2F2%29
2y=8%2F2%2B%281%2F2%29
2y=9%2F2
highlight%28y=9%2F4%29
3x%2B8y=4
3x%2B8%289%2F4%29=4
3x%2B%2818%29=4
3x=-14
highlight%28x=-14%2F3%29