Match each expression with its value. (this is khan academy)

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

Need ! discuss how to convert the standard form of the equation of a circle to the general form. 50 points

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.