Question 267302
(2,-5) and perpendicular to the line 
y=5x/2-4 (red line)
Slope=5/2.
The perpendicular line will have a slope=-2/5.
-5=2*-2/5+b
-5=-4/5+b
b=-5+4/5
b=-25/5-4/5
b=-29/5 ans. for the Y intercept.
y=-2x/5-29/5 (green line)
{{{ graph( 300, 200, -6, 5, -10, 10, 5x/2 -4, -2x/5 -29/5) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions 5x/2 -4 and -2x/5 -29/5).