What's the two parallel lines

Question

y= 2x + 4

2y = x + 4

2x + 2y =4

2x - y =4

Answer 1

First, write every equation in terms of y:

 

y = 2x + 4

y = (1/2)*x + 2

y = -x + 2

y = 2x - 4

 

The parallel lines are the ones with the same slope. For this problem they are the first and fourth ones.