Question

Help and please explain and tell me how to do it

Answer 1

You could take it the long way and plug in each x into the 4 equations to see which one puts out the exact y values. Another way you could do it is by finding the slope from two points using
`(y_2-y_1)/(x_2-x_1)`. For example, take (2,9) and (3,12).
`(12-9)/(3-2) =3`. So the slope is 3, which rules out choices a and d. Now plug in 2 for equations b and c. Only equation b gives you an answer of 9, so the answer is b) y=3x+3