Use the data in the given table for #4 to find the slope of the line through these four points. I did this this way:
5-3 2
m = -------- = ---- = 1/2
12-8 4
Now use y = mx + b to determine the y-intercept:
Borrowing the coefficients (0,0) from the table,
0 = (1/2)(0) + b. Thus, b = 0, and y = (1/2)x (answer)