When you want a line perpendicular to a line you have already... the slope has to be the opposite reciprocal.
example this line y= - 2x - 6
slope is -2 so opposite reciprocal is 1/2
so now we have the slope of the new line m=1/2
now we use point slope formula with the point (6,1)
y-y1= m (x - x1) plug and chug
y- 1 = (1/2) (x - 6)
y=1/2x-2
hope that helps
