### Home > A2C > Chapter 4 > Lesson 4.1.1 > Problem 4-10

4-10.

What is the *y*-intercept? Pick two points and determine the slope.

Refer to part (a).

Which value (*x* or *y*) is equal to 2 on this line? (Look at the point.)

All vertical lines have undefined slope and an equation of the form *x* = *k*.

Refer to part (a).

Use the eTool below to check your answers by graphing your equation.

Click the link at right for the full version of the eTool: A2C 4-10 HW eTool