How do i do this while i show all my work?

One way to determine the slope of a line is from two points on a line.

We can use the ones already indicated on the graph, (0,4) and (3,5).

The slope is change in y divided by change in x,

1/3

y = - 6

step-by-step explanation:

given the point (- 2, y) lies on the graph then it is a solution of it's equation.

substitute x = - 2 into the equation for value of y

y = 3(- 2) = 3 × - 2 = - 6

the point on the graph is (- 2, 6)