A family's gas bill averages $80 a month for seven months of the year and $20 a month for the rest of the year. If the family's bills were averaged over the entire year, what would the monthly bill be ?

step-by-step explanation:

let y equal to

the total fare and x is the mile of taxi ride. so the equation is

y = 0.55x + 1.75

since susie has

$10 to spend for a taxi cab, so he can have

10 = 0.55x +

1.75

x = 15 miles of

taxi ride

so the system of

inequality is

10 < 0.55x +

1.75

x > 2