### Home > A2C > Chapter 8 > Lesson 8.1.5 > Problem 8-85

8-85.

Does each *x*-value on the graph of the function have only one corresponding *y*-value?

Domain: −10 ≤ *x* ≤ 10

Range: −10 ≤ *y* ≤ 10

See the unit circle graph at right.

What portion of the circle is shaded?