Lines d, e, and f are parallel. That means they have the same slope.

Each of these lines has a slope of - 3.

Enter numbers to complete an equation for each line.

Line d y = - 3x - 3

Line e y = - 3x - 1

Line f y = - 3x+2

To write the equation of a line, you need the slope and the y-intercept. The slope of each line is - 3. Find the y-intercept on the graph and then substitute it into the equation y = mx+b for b.

Line d has y-intercept (0,-3)

y = - 3x - 3

Line e has y-intercept (0,-1)

y = - 3x - 1

Line f has y-intercept (0,2)

y = - 3x+2