SOLUTION: If x + 4 y = 10 and - x + 5 y = 8 what is the value of 3x - 2?

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Question 342648: If x + 4 y = 10 and - x + 5 y = 8 what is the value of 3x - 2?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Add the two equations together.
x%2B4y-x%2B5y=10%2B8
9y=18
y=2
Then use an equation to solve for x.
x%2B4%282%29=10
x%2B8=10
x=2
So then
3x-2=3%282%29-2
3x-2=6-2
3x-2=4