the table represents some points on the graph of a linear function. write a function that represents relationship.

x: -4, -2, 6. y: 10, 7, -5
y =

1 answer

To determine the linear function \( y = mx + b \) that represents the relationship, we need to find the slope (\( m \)) and the y-intercept (\( b \)).

First, let's find the slope \( m \). The formula for the slope between two points \((x_1, y_1)\) and \((x_2, y_2)\) is:

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

We can use two of the given points. Let's use the points \((-4, 10)\) and \((-2, 7)\):

\[ x_1 = -4, \quad y_1 = 10 \] \[ x_2 = -2, \quad y_2 = 7 \]

Calculating the slope:

\[ m = \frac{7 - 10}{-2 - (-4)} = \frac{-3}{2} = -\frac{3}{2} \]

Now, we can use the slope-intercept form of the equation to solve for \( b \) by substituting one of the points into the equation \( y = mx + b \). Let's use the point \((-2, 7)\):

\[ 7 = -\frac{3}{2}(-2) + b \]

Calculating \( -\frac{3}{2}(-2) \):

\[ 7 = 3 + b \]

To solve for \( b \), we subtract 3 from both sides:

\[ b = 7 - 3 = 4 \]

Now we have both \( m \) and \( b \):

\[ m = -\frac{3}{2}, \quad b = 4 \]

The equation of the linear function is:

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

Thus, the function that represents the relationship is:

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