If the price of an item is x dollars write an expression to represent the sale price of any item in the store

Need solving this second acceleration problem.

Solve the system of equations y= 3/2 - 1, -x+ y =-3

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.