Match each system of equations to its solution represented by an arguments matrix. Not all equations will be used

Solve x+3y=6 and 4x-6y=6 by elimination . show work !

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax

Which equation is y = -6x2 + 3x + 2 rewritten in vertex form?