SOLUTION: Determine which two equations represent parallel lines. I thought it was c&d but I was wrong. A) = 5/3 X +4 B) Y = - 3/5 X - 7 C) Y =2X+8 D) Y = 2X-4

Algebra ->  Equations -> SOLUTION: Determine which two equations represent parallel lines. I thought it was c&d but I was wrong. A) = 5/3 X +4 B) Y = - 3/5 X - 7 C) Y =2X+8 D) Y = 2X-4      Log On


   

Question 44426: Determine which two equations represent parallel lines. I thought it was c&d but I was wrong.

A) = 5/3 X +4

B) Y = - 3/5 X - 7

C) Y =2X+8
D) Y = 2X-4
Answer by pvaka(23) About Me  (Show Source):
You can put this solution on YOUR website!
The book answer maybe wrong!
Since parallel lines have the same steepness, their slopes (m) must be equal; also, lines with THE SAME SLOPE ARE PARALLEL.
C and D have the same slope; m=2
A and B are perpendicular. A perpendicular lines have a slope that is the negative reciprocal of 5/3, which is -3/5.