### Home > CCA2 > Chapter 2 > Lesson 2.1.1 > Problem2-9

2-9.

Write the equation for each graph. 2-9 HW eTool (Desmos). Homework Help ✎

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

$y = - \frac { 2 } { 3 } x - 4$

1. Refer to part (a).

1. 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 $x=k$.

1. 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: CCA2 2-9 HW eTool