Posted by Jay on .
write and equation of a line perpendicular to the line y=1/2x+10 and passes through (0,3)

geometry 
Steve,
since y=1/2 x+10 has slope 1/2, you want a line with slope 2.
Now you have a point and a slope, so
y3 = 2(x0)
y = 2x+3