+0

# Aops

0
31
1
+67

\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?

SydSu22  Oct 29, 2018
#1
+13578
+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

ElectricPavlov  Oct 29, 2018