Question 68693
Y=2/3X HAS A SLOPE OF 2/3 & A Y INTERCEPT OF 0.
--------------------------------------------------------------
{{{ graph( 300, 200, -6, 5, -10, 10, y = 2x/3) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, y = 2x/3). 
3X-24+6=0
3X=18
X=18/3
X=6 THIS SLOPE IS UNDEFINED AND DESCRIBES A VERTICLE LINE THROUGH X=6
-------------------------------------------------------------- 
a slope of 3 & passing through (1,3) is
y=3x+b
3=3*1+b
3=3+b
b=3-3
b=0 thus the equation is 
y=3x
------------------------------
a slope of 3 passing theough (2,0)is
0=3*2+b
b=-6 thus the equation of this line is
y=3x-6
------------------------------------