A limousine service charges 

$20 
plus 
$0.50 
per mile and a taxicab company charges 
$1.50 
per mile. Write and graph a system of equations for the cost of each ride, find the number of miles for each ride to cost the same, and determine which would be cheaper if a rider has to go 
30 
miles.

1 answer

Let x = miles.

$20 +$.50x = $1.50x

Solve for x, then substitute 30 for x.