How do I solve the system of equations using substitution for: 1. -4x - y = 6 -5x - y = 21
2. -7x - 2y = -17 x -2y = 10
3. -5x + y = -2 -3x + 6y = -12
4. -2x - 4y = -16 6x - 2y = 20

Find the roots of the equation below. x^2 - 6 + 9 = 0

At the beginning of year 1, carlos invests $600 at an annual compound interest rate of 4%. he makes no deposits to or withdrawals from the account. which explicit formula can be used to find the account's balance at the beginning of year 5? what is, the balance?

Nicole is making carrot bread she needs 5 cups of carrots for 2 cups of sugar. what is the ratio of cups of sugar to cups of carrots that nicole will need? write the ration in three different ways