Question 68517
X-2Y=8
X=2Y+8 NOW SUBSTITUTE (2Y+8) FOR X IN THE OTHER EQUATION 
3(2Y+8)-2Y=12
6Y+24-2Y=12
4Y=12-24
4Y=-12
Y=-12/4
Y=-3 SOLUTION NOW SUBSTITUTE -3 FOR Y & SOLVE FOR X
X-2*-3=8
X+6=8
X=8-6
X=2 SOLUTION
{{{ graph( 300, 200, -6, 5, -10, 10, y = x/2 - 4, y = 3x/2 -6) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions y = x/2 -4 and y = 3x/2 -6).