This is a linear model....note that everytime x changes by 1, y changes by 4......and the slope of a line = change in y / change in x = 4 / 1 = 4
And using the point (1,6), we have
y - 6 = 4(x - 1) simplify
y - 6 = 4x - 4 add 6 to both sides
y = 4x + 2
