To solve this system of equations by elimination, what operation could be used to eliminate the y-variable and find the value of x? 2x-4y=6 -3x+3y=12

Answer asap. you begin with 1/2 scoop of ice cream. since you're hungry, you ask the vendor for 2/7 more scoops of ice cream. then, you eat 5/8 scoops. how many scoops of ice cream are left on your cone? i will mark brainliest for first correct answer.