Question

Which pair of equations represents parallel lines A.y=2x+7 y=2x-7 B.y=2x-7 y=-1/2-7 C.y=2x+7 y=x+7

D.y=7 X=7

Answer 1

y = 2x + 7 and y = 2x - 7 → A

Note that 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 has m = 2 and y = 2x - 7 has m = 2

The only pair of lines with equal slopes is A