Posted by **bobpursley** on Sunday, March 11, 2007 at 10:59pm.

First the slope. Perpendicular to a slope of -3 means a line slope of 1/3

y= 1/3 x + b.

Now put in the x,y point and solve for b.

write the equation of a line that has a y intercept (0,5) and is perpendicular to the line with equation y=-3x+1