4a-b=10
a+3b=9
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4a-b=10
a+3b=9
Solve for a or b in either equation. Then substitute your new equation into the equation you didn't solve for yet.
So, if you solve for a in the bottom equation, what would a=?
Then plug into the top equation. If you need more help, tell me what a= in the bottom equation then I will help you plug it into the top one.
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