Explain how you can determine the following system has one unique solution- with out actually solving it 2x+y=4
2y=6-2x

What is the slope of the line that contains the points (-2,1) and (0,-3)

What are the digits that repeat in the smallest sequence of repeating digits in the decimal equivalent of 24/11?

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?