10. Which pair of equations represents parallel lines?

y=7

x=7

y = 2x+7

y = x+7

y = 2x-7

y=-1/2-7

y = 2x + 7

y = 2x - 7

y = 2x + 7 and y = 2x - 7

Step-by-step explanation:

• Parallel lines have equal slopes

The equation of a line in slope - intercept form is

y = mx + c (m is the slope and c the y - intercept)

y = 2x + 7 ← is in slope - intercept form

with slope m = 2

y = 2x - 7 ← is in slope - intercept form

with slope m = 2

Thus y = 2x + 7 and y = 2x - 7 are parallel lines