Graph 9x-y<9

$9 x - y < 9$

Step 1

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

Solve for $y$ .

Subtract $9 x$ from both sides of the inequality.

$- y < 9 - 9 x$

Divide each term in $- y < 9 - 9 x$ by $- 1$ and simplify.

Divide each term in $- y < 9 - 9 x$ by $- 1$ . When multiplying or dividing both sides of an inequality by a negative value, flip the direction of the inequality sign.

$\frac{- y}{- 1} > \frac{9}{- 1} + \frac{- 9 x}{- 1}$

Simplify the left side.

Dividing two negative values results in a positive value.

$\frac{y}{1} > \frac{9}{- 1} + \frac{- 9 x}{- 1}$

Divide $y$ by $1$ .

$y > \frac{9}{- 1} + \frac{- 9 x}{- 1}$

Simplify the right side.

Simplify each term.

Divide $9$ by $- 1$ .

$y > - 9 + \frac{- 9 x}{- 1}$

Move the negative one from the denominator of $\frac{- 9 x}{- 1}$ .

$y > - 9 - 1 \cdot (- 9 x)$

Rewrite $- 1 \cdot (- 9 x)$ as $- (- 9 x)$ .

$y > - 9 - (- 9 x)$

Multiply $- 9$ by $- 1$ .

$y > - 9 + 9 x$

Rearrange terms.

$y > 9 x - 9$

Step 2

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

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

$y = m x + b$

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

$m = 9$

$b = - 9$

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

Slope: $9$

y-intercept: $(0, - 9)$

Slope: $9$

y-intercept: $(0, - 9)$

Step 3

Graph a dashed line, then shade the area above the boundary line since $y$ is greater than $9 x - 9$ .

$y > 9 x - 9$

Step 4

Graph 9x-y<9

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