How to rewrite the function g(x) =x^2 - x - 6 by completing the square

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

Problem 3 a bank charges a service fee of $7.50 per month for a checking account. a bank account has $85.00. if no money is deposited or withdrawn except the service charge, how many months until the account balance is negative

Which of these lines passes through the point (1,-1) and has a slope of -3?