Question 270397
(1,4) (5,6)
Y=mX+b m=slope & b= the Y intercept.
m=(Y2-Y1)/(X2-X1)
m=(6-4)/(5-1)=2/4=1/2 ans. for the slope.
4=1/2*1+b
4=1/2+b
b=4-1/2
b=3 1/2 or 7/2 is the Y intercept.
Y=X/2+7/2 line equation. 
{{{ graph( 300, 200, -8, 5, -10, 10, x/2 +7/2) }}} (graph 300x200 pixels, x from -8 to 5, y from -10 to 10, x/2 +7/2).