question 8 and 9, you can give me 1 of the answers if the other one doesn't make sense:) im really confused

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11

Neal buys a board game. he pays for the board game and pays $1.54 in sales tax. the sales tax rate is 5.5%. what is the original price of the board game, before tax

Right triangle abc and its image, triangle a'b'c' are shown below. algebraically prove that a clockwise and counterclockwise rotation of 180o about the origin for triangle abc are equivalent rotations.