Help please! ill mark brainliest

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount

Delbert keeps track of total of the total number of points he earns on homework assignments, each of which is worth 60 points. at the end of the semester he has 810 points. write an equation for delbert’s average homework score a in terms of the number of assignments n.