What is the equation of the line that goes through (−4, 5) and (8, 14)?

y=
3
4

x+5

y=
4
3

x+5

y=
3
4

x+8

y=
4
3

x+8

1 answer

To find the equation of the line that goes through the points \((-4, 5)\) and \((8, 14)\), we first need to calculate the slope of the line. The slope (m) is given by the formula:

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

Plugging in the coordinates of the two points: \((x_1, y_1) = (-4, 5)\) and \((x_2, y_2) = (8, 14)\), we have:

\[ m = \frac{14 - 5}{8 - (-4)} = \frac{9}{12} = \frac{3}{4} \]

Now that we have the slope \(m = \frac{3}{4}\), we can use the point-slope form of the equation of a line:

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

Using one of our points, say \((-4, 5)\):

\[ y - 5 = \frac{3}{4}(x - (-4)) \] \[ y - 5 = \frac{3}{4}(x + 4) \]

Next, we simplify this equation:

\[ y - 5 = \frac{3}{4}x + 3 \] \[ y = \frac{3}{4}x + 8 \]

Now, let's compare this with the options provided:

  1. \(y = \frac{3}{4}x + 5\)
  2. \(y = \frac{4}{3}x + 5\)
  3. \(y = \frac{3}{4}x + 8\)
  4. \(y = \frac{4}{3}x + 8\)

The correct equation for the line that goes through the points \((-4, 5)\) and \((8, 14)\) is:

\[ \boxed{y = \frac{3}{4}x + 8} \]