Find the Equation Using Point-Slope Formula (1,1) , (4,1)

$(1, 1)$ , $(4, 1)$

Step 1

Find the slope of the line between $(1, 1)$ and $(4, 1)$ using $m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}}$ , which is the change of $y$ over the change of $x$ .

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

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

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).

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

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

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

Simplify.

Simplify the numerator.

Multiply $- 1$ by $1$ .

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

Subtract $1$ from $1$ .

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

Simplify the denominator.

Multiply $- 1$ by $1$ .

$m = \frac{0}{4 - 1}$

Subtract $1$ from $4$ .

$m = \frac{0}{3}$

Divide $0$ by $3$ .

$m = 0$

Step 2

Use the slope $0$ and a given point $(1, 1)$ to substitute for $x_{1}$ and $y_{1}$ in the point-slope form $y - y_{1} = m (x - x_{1})$ , which is derived from the slope equation $m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}}$ .

$y - (1) = 0 \cdot (x - (1))$

Step 3

Simplify the equation and keep it in point-slope form.

$y - 1 = 0 \cdot (x - 1)$

Step 4

Solve for $y$ .

Multiply $0$ by $x - 1$ .

$y - 1 = 0$

Add $1$ to both sides of the equation.

$y = 1$

Step 5

List the equation in different forms.

Slope-intercept form:

$y = 1$

Point-slope form:

$y - 1 = 0 \cdot (x - 1)$

Step 6

Find the Equation Using Point-Slope Formula (1,1) , (4,1)

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