Question

Josie graphed a like with the same slope as y=3x, but that intercepted the y-axis 6 units above y =3x. What is the equation of the line Josie graphed?

A) y = 3x + 6

B) y = 6x

C) y = 9x

D) y = 9x + 6

Answer 1

A) y=3x+6

Explanation:

A line's equation is written as y=mx+b where m is the slope and b is the y-intercept. If the line has the same slope as y=3x then m=3. It also crosses 6 units above y=3x. y=3x crosses at (0,0) since b=0 so b=6 in the other line. This means the equation is y=3x+6.