Use the points (2, 3) and (-1, -5), and the slope of 8/3, and write an equation in slope intercept form

1 answer

To write the equation of a line in slope-intercept form (y = mx + b) given a slope \( m \) and a point \((x_1, y_1)\), we can use the point-slope form of the equation, which is:

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

Given:

  • Slope \( m = \frac{8}{3} \)
  • Point \( (x_1, y_1) = (2, 3) \)

Substituting these values into the point-slope formula:

\[ y - 3 = \frac{8}{3}(x - 2) \]

Now, simplify this equation:

  1. Distribute the slope on the right side:

\[ y - 3 = \frac{8}{3}x - \frac{16}{3} \]

  1. Add 3 to both sides to solve for \( y \):

\[ y = \frac{8}{3}x - \frac{16}{3} + 3 \]

  1. Convert 3 into a fraction with a denominator of 3:

\[ 3 = \frac{9}{3} \]

So,

\[ y = \frac{8}{3}x - \frac{16}{3} + \frac{9}{3} \]

  1. Combine the constant terms:

\[ y = \frac{8}{3}x - \frac{7}{3} \]

Thus, the equation of the line in slope-intercept form is:

\[ y = \frac{8}{3}x - \frac{7}{3} \]