Bao is deciding between two truck rental companies. Company A charges an initial fee of $70 for the rental plus $2.50 per mile driven. Company B charges an initial fee of $100 for the rental plus $1.50 per mile driven. Let A represent the amount Company A would charge if Bao drives x miles, and let B represent the amount Company B would charge if Bao drives x miles. Write an equation for each situation, in terms of x, and determine the interval of miles driven, x, for which Company A is cheaper than Company B.