13.

A line passes through (3, –2) and (6, 2). Write an equation for the line in point-slope form.
Rewrite the equation in standard form using integers.

1 answer

To find the equation of the line that passes through the points (3, -2) and (6, 2), we first need to calculate the slope (m) of the line using the formula:

\[ m = \frac{y_2 - y_1}{x_2 - x_1} \]

Using the points (x₁, y₁) = (3, -2) and (x₂, y₂) = (6, 2):

\[ m = \frac{2 - (-2)}{6 - 3} = \frac{2 + 2}{3} = \frac{4}{3} \]

Now that we have the slope, we can write the equation of the line in point-slope form, which is given by:

\[ y - y_1 = m(x - x_1) \]

Using point (3, -2):

\[ y - (-2) = \frac{4}{3}(x - 3) \] This simplifies to:

\[ y + 2 = \frac{4}{3}(x - 3) \]

Next, we will convert this equation to standard form (Ax + By = C) by rearranging and clearing any fractions. First, let's expand and simplify:

\[ y + 2 = \frac{4}{3}x - \frac{4}{3} \cdot 3 \] \[ y + 2 = \frac{4}{3}x - 4 \]

Now, to isolate \(y\), we subtract 2 from both sides:

\[ y = \frac{4}{3}x - 6 \]

Next, we'll move all terms to one side to create the standard form. To eliminate the fraction, we can multiply the entire equation by 3:

\[ 3y = 4x - 18 \]

Now, rearranging gives:

\[ 4x - 3y = 18 \]

Therefore, the equation of the line in standard form is:

\[ 4x - 3y = 18 \]

To summarize, the final equations are:

  • Point-slope form: \(y + 2 = \frac{4}{3}(x - 3)\)
  • Standard form: \(4x - 3y = 18\)