Write an expression of the calculation of the products of five and two and five and one

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

2x minus y equals 6, x plus y equals negative 3

Ashley spent half of her lunch money on a turkey sandwich. then she spent two-thirds of the money she had left on a bottle of juice and the rest of the money on a cookie. if the cookie cost $.75, how much lunch money did ashley have to start with?