How do i work this problem out?

This is asking for the cube root of 64. Another way of phrasing this is "What number cubed is equal to 64?" We know that 2³ is 8, so it must be a number greater than 2. 3³ is 27, it must be larger. 4³ is equal to 64, so 4 is your answer.

y=3x+4

step-by-step explanation:

given the points a(0,4) and b(-4, -8)

eqn of line ab: (y-4)/(x-0)=(-8-4)/(-4-0)

(y-4)/x=-12/-4=3

y=3x+4