Answer:
[tex]first \\ y \: intercept = 2 \\ slope = \frac{0 - 2}{4 - 0} = - 0.5 \\ [/tex]
[tex]second \\ y \: intercept = - 2 \\ slope = \frac{ - 1 - ( - 2)}{6 - 0} = \frac{1}{6} [/tex]
[tex]third \\ slope = \frac{100 - 60}{3 - 2} = 20 = add \: each \: month \\ start \: money = 60 - 1 \times 20 = 40[/tex]
