20 PNTS FOR ALL ANSWERS SOLVED!!

Me i'm timed right now! a. (0,-5)b. (0,-3)c. (0,3) d. (0,5)

What is the slope of the line that has an equation of y equals x -3

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%?