Pre-Algebra Examples

$(- 4, 0)$ , $(3, 1)$

Step 1

Find the value of the slope.

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Step 1.1

Slope is equal to the change in $y$ over the change in $x$ , or rise over run.

$m = \frac{change in y}{change in x}$

Step 1.2

The change in $x$ is equal to the difference in x-coordinates (also called run), and the change in $y$ is equal to the difference in y-coordinates (also called rise).

$m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}}$

Step 1.3

Substitute in the values of $x$ and $y$ into the equation to find the slope.

$m = \frac{1 - (0)}{3 - (- 4)}$

Step 1.4

Simplify.

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Step 1.4.1

Simplify the numerator.

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Step 1.4.1.1

Multiply $- 1$ by $0$ .

$m = \frac{1 + 0}{3 - (- 4)}$

Step 1.4.1.2

Add $1$ and $0$ .

$m = \frac{1}{3 - (- 4)}$

Step 1.4.2

Simplify the denominator.

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Step 1.4.2.1

Multiply $- 1$ by $- 4$ .

$m = \frac{1}{3 + 4}$

Step 1.4.2.2

Add $3$ and $4$ .

$m = \frac{1}{7}$

Step 2

Find the value of the y-intercept.

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Step 2.1

Substitute the value of $m$ into the slope-intercept form of the equation, $y = m x + b$ .

$y = (\frac{1}{7}) x + b$

Step 2.2

Substitute the value of $x$ into the slope-intercept form of the equation, $y = m x + b$ .

$y = (\frac{1}{7}) \cdot (- 4) + b$

Step 2.3

Substitute the value of $y$ into the slope-intercept form of the equation, $y = m x + b$ .

$0 = (\frac{1}{7}) \cdot (- 4) + b$

Step 2.4

Rewrite the equation as $(\frac{1}{7}) \cdot (- 4) + b = 0$ .

$(\frac{1}{7}) \cdot (- 4) + b = 0$

Step 2.5

Simplify each term.

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Step 2.5.1

Combine $\frac{1}{7}$ and $- 4$ .

$\frac{- 4}{7} + b = 0$

Step 2.5.2

Move the negative in front of the fraction.

$- \frac{4}{7} + b = 0$

Step 2.6

Add $\frac{4}{7}$ to both sides of the equation.

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

Step 3

List the slope and y-intercept.

Slope: $\frac{1}{7}$

y-intercept: $(0, \frac{4}{7})$

Step 4