Question 155734
(8,9); 
9x+y=6
y=-9x+6 this line has a slope=-9
9=-9*8+b
9=-72+b
b=9+72
b=81 the y intercept.
y=9x+81
{{{ graph( 300, 200, -20, 5, -10, 100, 9x +81) }}} (graph 300x200 pixels, x from -20 to 5, y from -10 to 100, 9x +81).