# Coordinate Planes

• December 12th 2010, 08:02 PM
HRoseJ
Coordinate Planes
Lines a and b lie in the same plane. The equation for line a is y = 5x + 3. Line b is parallel to line a. On the coordinate plane, line b passes through -3 on the y-axis. Explain in detail using words and numbers how you can use the equation for line a to write the equation for line b.

What is the equation for line b?
• December 12th 2010, 08:14 PM
dwsmith
$\displaystyle m_{perpendicular}=\frac{-1}{m}$

Does line a pass through -3 as well?
• December 13th 2010, 04:07 AM
HallsofIvy
dwsmith, the question says that line b is parallel to line a, not perpendicular.