Graph x-3y=-15 x=-3

$x - 3 y = - 15$ $x = - 3$

Graph $x - 3 y = - 15$ .

Solve for $y$ .

Subtract $x$ from both sides of the equation.

$- 3 y = - 15 - x$

Divide each term in $- 3 y = - 15 - x$ by $- 3$ and simplify.

Divide each term in $- 3 y = - 15 - x$ by $- 3$ .

$\frac{- 3 y}{- 3} = \frac{- 15}{- 3} + \frac{- x}{- 3}$

Simplify the left side.

Cancel the common factor of $- 3$ .

Cancel the common factor.

$\frac{- 3 y}{- 3} = \frac{- 15}{- 3} + \frac{- x}{- 3}$

Divide $y$ by $1$ .

$y = \frac{- 15}{- 3} + \frac{- x}{- 3}$

Simplify the right side.

Simplify each term.

Divide $- 15$ by $- 3$ .

$y = 5 + \frac{- x}{- 3}$

Dividing two negative values results in a positive value.

$y = 5 + \frac{x}{3}$

Rewrite in slope-intercept form.

The slope-intercept form is $y = m x + b$ , where $m$ is the slope and $b$ is the y-intercept.

$y = m x + b$

Reorder $5$ and $\frac{x}{3}$ .

$y = \frac{x}{3} + 5$

Reorder terms.

$y = \frac{1}{3} x + 5$

Use the slope-intercept form to find the slope and y-intercept.

Find the values of $m$ and $b$ using the form $y = m x + b$ .

$m = \frac{1}{3}$

$b = 5$

The slope of the line is the value of $m$ , and the y-intercept is the value of $b$ .

Slope: $\frac{1}{3}$

y-intercept: $(0, 5)$

Slope: $\frac{1}{3}$

y-intercept: $(0, 5)$

Any line can be graphed using two points. Select two $x$ values, and plug them into the equation to find the corresponding $y$ values.

Write in $y = m x + b$ form.

Reorder $5$ and $\frac{x}{3}$ .

$y = \frac{x}{3} + 5$

Reorder terms.

$y = \frac{1}{3} x + 5$

Create a table of the $x$ and $y$ values.

$\begin{array}{c} x & y \\ 0 & 5 \\ 3 & 6 \end{array}$

Graph the line using the slope and the y-intercept, or the points.

Slope: $\frac{1}{3}$

y-intercept: $(0, 5)$

$\begin{array}{c} x & y \\ 0 & 5 \\ 3 & 6 \end{array}$

Slope: $\frac{1}{3}$

y-intercept: $(0, 5)$

$\begin{array}{c} x & y \\ 0 & 5 \\ 3 & 6 \end{array}$

Graph $x = - 3$ .

Since $x = - 3$ is a vertical line, there is no y-intercept and the slope is undefined.

Slope: Undefined

y-intercept: No y-intercept

Find two points on the line.

$\begin{array}{c} x & y \\ - 3 & 0 \\ - 3 & 1 \end{array}$

Graph the line using the slope, y-intercept, and two points.

Slope: Undefined

y-intercept: No y-intercept

$\begin{array}{c} x & y \\ - 3 & 0 \\ - 3 & 1 \end{array}$

Slope: Undefined

y-intercept: No y-intercept

$\begin{array}{c} x & y \\ - 3 & 0 \\ - 3 & 1 \end{array}$

Plot each graph on the same coordinate system.

$x - 3 y = - 15$

$x = - 3$

Graph x-3y=-15 x=-3

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