\begin{align*}3x+7y&=18\\2x-2y&=2\end{align*}

Given the system of equations above, if ax+ay=16, what is the value of a ?


 


         
  

Comments (2)

Why would you add the equations in this instance? Could you not just subtract the two equations to get x + 5y = 16? Then wouldn’t the a value be 6 because 1 + 5 = 6?

I understand the solution, i’m just not sure as to why we added the equations.

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