Math question algebra 2 help

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Taber invested money in an account where interest is compounded every year. he made no withdrawals or deposits. the function a(t)=525(1+0.05)^t represent the amount of money in the account after t years. how much money did taber origanally invested?

What is the remainder when 3x^2-x-10 is divided by x-1 -6,-7,-8, or -9