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\(\begin{align*} 4x-3y&=2a,\\ 2x+y&=3a, \end{align*}\) 

 

If the solution (x,y) works and x=3 what is the value of a?

 Oct 29, 2018
 #1
avatar+17209 
+2

Multiply second equation by '3' then add the two equations together to get

 

10x = 11a       and with x= 3

30 = 11 a       or a = 30/11

 Oct 29, 2018

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