Explain why it makes sense to use a negative number to represent Kirans account balance when he owes money

Point a (7,3) is translated to a'(16,-9). which rule describes the translation?

1. a music store marks up the instruments it sells by 30%. a. if the store bought a guitar for $45, what will be its store price? b. if the price tag on a trumpet says $104, how much did the store pay for it? c. if the store paid $75 for a clarinet and sold it for $100, did the store mark up the price by 30%?

Mathematics viiwhat is the coefficient of a variable that appears by itself, like "a"?