Posted by Jon on Monday, February 25, 2008 at 4:14pm.
Write an equation for the line that passes through (0,7) and is perpendicular to the line whose equation is y=1/2x1.
yy1=m(xx1)
y7=2/1(x0)
y7=2x0
y=2x+7(answer)

Math  drwls, Monday, February 25, 2008 at 4:17pm
The slope of the line you want is 2.
(y7) = 2(x0)
y = 2x + 7 
Math?  Jon, Monday, February 25, 2008 at 4:20pm
Where did you get negative 2??

Math  drwls, Monday, February 25, 2008 at 4:25pm
The product of the slopes of two perpendicular lines has to be 1. That should be in your textbook or class notes somewhere.
(1/2) * 2 = 1