Question

Which lines are parallel?
I. y = -2x + 1 II. y = x - 4
III. y = -x + 5 IV. y = 3 - 2x

Answer 1

Parallel lines are defined as equal slopes.
so if slope of line 1 is the same as the slope of line 2 they are parallel.
(I) -2 is the same as (IV) -2
none of the others are equal.

Answer 2

thanks so much