x 2 4 6 8 10

g(x) −4 −1 2 5 8

Notice that g(x) increases by 3 units for every 2-unit increase in x. Therefore, it increases by 1.5 units for every 1-unit increase in x. Thus, the slope is

We know that b is the value of g(0). We are not told what g(0) is, but we can compute its value by "backtracking" from its value at x = 2, given as −4. Since g increases by 3 units for each 2-unit increase in x, g(0) must be given by

We can now put this all together to obtain

Enter this as 1.5*x-7