Which ordered pair is a solution of the equation y=3x?

Three children each had the same amount of money in their savings account. one of the children withdrew three quarters of her moneyand spent it all on a $100 sports jersey. what was the total amount of money originally in the accounts?

2x minus y equals 6, x plus y equals negative 3

Pls math have no ideamultiply and simppify. 2x^2y^3z^2 • 4xy^4x^2