Question 242706
Through (1,-8), perpendicular to -7-4y=25. 
-7-4y=25
-4Y=25+7
-4Y=32
Y=32/-4
Y=-8 ANSWER FOR THE Y INTERCEPT.
{{{ graph( 300, 200, -6, 5, -10, 10, y = -8) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, y = -8).