2(5) -4y = -16

solve the system by elimination

-2(5) = -10
-10 - 4y= -16
+10 +10
-4y = -6
/ -4 /-4
y = 1.5

The appropriate decay equation will have the following form: b = ne^(kt).here the initial population is 3500, so b = 3500e^(-0.022[6]).                                                b = 3500e^(-1.32)                                                b = 3500(0.2671) = 934 (rounded down from                                                                                  934.97).