Question 249605
(4,1) and (12,8)
Y=mX+b
Slope=(y2-y1)/(x2-x1)=(8-1)/(12-4)=7/8 is the slope
1=7*4/8+b
1=28/8+b
b=1-28/8
b=8/8-28/8
b=-20/8=-2.5 ans. for the y intercept.
y=7x/8-2.5
{{{ graph( 300, 200, -6, 5, -10, 10, 7x/8 -2.5) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, 7x/8 -2.5).