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If the system of equations

3x + y = a

2x + 5y = 2a

has a solution (x,y) when x = -2, compute a

 Oct 30, 2022
 #1
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First, substitute -2 into x.

So...

-6+y=a

-4+5y=2a

 

If we double the first equation, then -12+2y=2a. Subtract the first and second equations, and you can solve the rest from there

 Oct 30, 2022

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