Lines and Slopes Math
posted by Mathew on .
A line is perpendicular to x+3y4=0 and has the same yintercept as 2x+5y20=0. Find an equation for the line

Here are two hints:
(1) The first equation tells you that the slope of the line you are looking for is m = 3. That is because the line you want to be perpendicular to has a slope of 1/3.
(2) The yintercept of the line you want is b = 20/5 = 4. The point is located at (0,4)
y = mx + b
Substitute in the m and b values from above. 
y=1/3x+4