Question

Which of the lines, if any, are parallel

Answer 1

a and c are parallel.

Explanation:

Let's find slope for each line.

If slopes of lines are same then they are parallel.

for line described by a : slope =
`(0-(-2))/(1-(-1))` = 1

For line b slope =
`(-2-2)/(2-4)` = 2

For line c slope =
`(1-2)/(-1-0)` =1

So slope of lines a and c are same. a and c are parallel to each other.