Question 938384
Horizontal, Perpendicular, Postive Slope(slant right), Negative slope(Slant left)
{{{drawing(300,300,   -6, 6, -6, 6, grid(1), blue(line(2.5,6,2.5,-6)) ,
graph( 300, 300, -6, 6, -6, 6,0,3, -x + 1, 2x + 2) )}}}