10. find the solution to the systems of equations
-6x-2y+2z= -8
3x-2y -4z=8
6x-2y-6z = -18

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%?