Question 343556
3x-y=9 
-y=-3x+9
y=3x-9 (red line)
7x+2y=1
2y=-7x+1
y=-7x/2+1/2
y=-3.5x+.5 (green line)
{{{ graph( 300, 200, -6, 5, -10, 10, 3x -9, -3.5x +.5) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions 3x +9 and -3/5x +.5). 
Ans.(1.31,-5.07)