Question 264116
4x-y=9
-y=-4x=9
y=4x-9( red line)
2x+3y=27
3y=-2x+27
y=-2x/3+27/3
y=-2x/3+9 (green line)
{{{ graph( 300, 200, -6, 5, -10, 10, 4x -9, -2x/3 +9 ) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions 4x -9 and -2x/3 +9). 
Intercept=(4,7) 

(0,-9)