Please help me which expression is equivalent to giving expression

Use the elimination method to solve the system of equations -x+5y=-4 and 4x+3y=16

Which of the following is correct interpretation of the expression -4+13

Acomputer store buys a computer system at a cost of $370.80. the selling price was first at $ 618, but then the store advertised a 20 % markdown on the system. answer parts a and b. a. find the current sale price.