Evaluate the expression 2x-4y if x=3 and y=(1/2)

Giuseppi's pizza had orders for $931.00 of pizzas. the prices were $21 for a large pizza, 514 for a medium pizza, and $7 for a small pizza. the number of large pizzas was two less than four times the number of medium pizzas. thenumber of small pizzas was three more than three times the number of medium pizzas. how many of each size of pizza were ordered?

Find the solution of this system of equation -7x+y=-20 9x-3y=36

Will give brainliest immeadeately true or false: the origin woud be included in the solution set for the inequality: y< 2x-5