Find the Equation Using Two Points (2,4) , (6,7)

$(2, 4)$ , $(6, 7)$

Step 1

Use $y = m x + b$ to calculate the equation of the line, where $m$ represents the slope and $b$ represents the y-intercept.

To calculate the equation of the line, use the $y = m x + b$ format.

Step 2

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 3

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 4

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

$m = \frac{7 - (4)}{6 - (2)}$

Step 5

Finding the slope $m$ .

Simplify the numerator.

Multiply $- 1$ by $4$ .

$m = \frac{7 - 4}{6 - (2)}$

Subtract $4$ from $7$ .

$m = \frac{3}{6 - (2)}$

Simplify the denominator.

Multiply $- 1$ by $2$ .

$m = \frac{3}{6 - 2}$

Subtract $2$ from $6$ .

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

Step 6

Find the value of $b$ using the formula for the equation of a line.

Use the formula for the equation of a line to find $b$ .

$y = m x + b$

Substitute the value of $m$ into the equation.

$y = (\frac{3}{4}) x + b$

Substitute the value of $x$ into the equation.

$y = (\frac{3}{4}) \cdot (2) + b$

Substitute the value of $y$ into the equation.

$4 = (\frac{3}{4}) \cdot (2) + b$

Find the value of $b$ .

Rewrite the equation as $\frac{3}{4} \cdot 2 + b = 4$ .

$\frac{3}{4} \cdot 2 + b = 4$

Cancel the common factor of $2$ .

Factor $2$ out of $4$ .

$\frac{3}{2 (2)} \cdot 2 + b = 4$

Cancel the common factor.

$\frac{3}{2 \cdot 2} \cdot 2 + b = 4$

Rewrite the expression.

$\frac{3}{2} + b = 4$

Move all terms not containing $b$ to the right side of the equation.

Subtract $\frac{3}{2}$ from both sides of the equation.

$b = 4 - \frac{3}{2}$

To write $4$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$b = 4 \cdot \frac{2}{2} - \frac{3}{2}$

Combine $4$ and $\frac{2}{2}$ .

$b = \frac{4 \cdot 2}{2} - \frac{3}{2}$

Combine the numerators over the common denominator.

$b = \frac{4 \cdot 2 - 3}{2}$

Simplify the numerator.

Multiply $4$ by $2$ .

$b = \frac{8 - 3}{2}$

Subtract $3$ from $8$ .

$b = \frac{5}{2}$

Step 7

Now that the values of $m$ (slope) and $b$ (y-intercept) are known, substitute them into $y = m x + b$ to find the equation of the line.

$y = \frac{3}{4} x + \frac{5}{2}$

Step 8

Find the Equation Using Two Points (2,4) , (6,7)

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