The Amount $A$ Of Money on Deposit For $t$ Years in an Account Earning Simple Interest Is a Linear

Multiple Choice

The amount $A$ of money on deposit for $t$ years in an account earning simple interest is a linear function of $t$ . Express that function as an equation if $A = \$ 85$ when $t = 8$ and $A = \$ 40$ when $t = 3$ .

A) $A = 40 t - 13$
B) $A = 9 t + 13$
C) $A = - 9 t + 13$
D) $A = 9 t - 13$
E) $A = 40 t + 13$