Internet Company A charges a $25 fee plus an additional $0.35 per hour. Internet Company B charges a $10 fee plus an additional $0.50 per hour. For what number of hours are the charges for both companies the same?

First we write their total charges as equations. Then we solve for t - the number of hours when both charges are equal 
 

 

When they charge the same A=B and we can write 

 

 

 



so t=100 hours 


:)