If y varies directly as x, and x = 4 when y = 20, find y when x = 18.

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.

Which of the following best describes the graph below? + + 2 + 3 + 4 1 o a. it is not a function. o b. it is a one-to-one function. o c. it is a many-to-one function. o d. it is a function, but it is not one-to-one.