Question 207610
Y=mX+b
m=slope=(y2-y1)/(x2-x1)=(-4-0)/6-4)=-4/2=-2 is the slope.
a)=-2
0=-2*4+b
0=-8+b
b=8 is the y intercept.
b) Y=-2X+8 
{{{ graph( 300, 200, -6, 5, -10, 10, -2x +8) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, -2x +8).