Graph 7x-4y=28

$7 x - 4 y = 28$

Step 1

Solve for $y$ .

Subtract $7 x$ from both sides of the equation.

$- 4 y = 28 - 7 x$

Divide each term in $- 4 y = 28 - 7 x$ by $- 4$ and simplify.

Divide each term in $- 4 y = 28 - 7 x$ by $- 4$ .

$\frac{- 4 y}{- 4} = \frac{28}{- 4} + \frac{- 7 x}{- 4}$

Simplify the left side.

Cancel the common factor of $- 4$ .

Cancel the common factor.

$\frac{- 4 y}{- 4} = \frac{28}{- 4} + \frac{- 7 x}{- 4}$

Divide $y$ by $1$ .

$y = \frac{28}{- 4} + \frac{- 7 x}{- 4}$

Simplify the right side.

Simplify each term.

Divide $28$ by $- 4$ .

$y = - 7 + \frac{- 7 x}{- 4}$

Dividing two negative values results in a positive value.

$y = - 7 + \frac{7 x}{4}$

Step 2

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 $- 7$ and $\frac{7 x}{4}$ .

$y = \frac{7 x}{4} - 7$

Reorder terms.

$y = \frac{7}{4} x - 7$

Step 3

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

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

$m = \frac{7}{4}$

$b = - 7$

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

Slope: $\frac{7}{4}$

y-intercept: $(0, - 7)$

Slope: $\frac{7}{4}$

y-intercept: $(0, - 7)$

Step 4

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 $- 7$ and $\frac{7 x}{4}$ .

$y = \frac{7 x}{4} - 7$

Reorder terms.

$y = \frac{7}{4} x - 7$

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

$\begin{array}{c} x & y \\ 0 & - 7 \\ 4 & 0 \end{array}$

Step 5

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

Slope: $\frac{7}{4}$

y-intercept: $(0, - 7)$

$\begin{array}{c} x & y \\ 0 & - 7 \\ 4 & 0 \end{array}$

Step 6

Graph 7x-4y=28

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