Question 1085883
<font color="black" face="times" size="3">x = number of miles driven per day
y = total cost per day


Plan A: y = 42
Plan B: y = 26 + 0.20x


We want to figure out when plan B costs more, so,


(Cost of Plan A) < (Cost of Plan B)
42 < 26 + 0.20x
42 - 26 < 26 + 0.20x - 26
16 < 0.20x
0.20x > 16
0.20x/0.20 > 16/0.20
x > 80


So if you drive <font color=red>more than 80 miles per day</font>, then plan B will cost more.</font>