Question 228304
(4,2) and is perpendicular to the line 
y=3-2x
y=-2x+3 this line has a slope=-2. (red line)
A perpendicular lne will habe a slope=1/2.
Y=mX+b
2=1/2*4+b
2=2+b
b=2-2
b=0
y=x/2 is this perpendicular line. (green line)
{{{ graph( 200, 200, -6, 5, -6, 5, -2x +3, x/2) }}} (graph 200x200 pixels, x from -6 to 5, y from -6 to 5, of TWO functions -2x +3 and x/2).