SOLUTION: Determine which two equations represent parallel lines. (a) y = 9x – 7 (b) y = –9x + 7 (c) y = 9x + 3 (d) y = x – 7 HELP

You can put this solution on YOUR website!
Let's use the slope-intercept form because these equations are in that form.

NOTE:Lines are parallel if and only if their slopes are equal.

In this form, m is the slope.
So, we will find a pair with the same slope.

a)m=9
b)m=-9
c)m=9
d)m=1

Thus, a) and c) are parallel. Wanna see some proof? Look below!




Power up,
HyperBrain!