Use a graphing calculator to graph the original function y=1/2x−4 and the vertically dilated function with a factor k=6. Determine the x-intercepts of both functions.(1 point)

Responses

The original function has an x-intercept of (0,−4), and the dilated function has an x-intercept of (0,−24).
The original function has an x -intercept of left parenthesis 0 comma negative 4 right parenthesis , and the dilated function has an x -intercept of left parenthesis 0 comma negative 24 right parenthesis .

The original function has an x-intercept of (8,0), and the dilated function has an x-intercept of (8,0).
The original function has an x -intercept of left parenthesis 8 comma 0 right parenthesis , and the dilated function has an x -intercept of left parenthesis 8 comma 0 right parenthesis .

The original function has an x-intercept of (−8,0), and the dilated function has an x-intercept of (−8,0).
The original function has an x -intercept of left parenthesis negative 8 comma 0 right parenthesis , and the dilated function has an x -intercept of left parenthesis negative 8 comma 0 right parenthesis .

The original function has an x-intercept of (8,0), and the dilated function has an x-intercept of (48,0).

1 answer

Let's start by finding the x-intercepts of the original function and the vertically dilated function.

The original function is given as: \[ y = \frac{1}{2}x - 4 \]

To find the x-intercept, we set \( y = 0 \) and solve for \( x \): \[ 0 = \frac{1}{2}x - 4 \] \[ \frac{1}{2}x = 4 \] \[ x = 4 \cdot 2 \] \[ x = 8 \]

So the x-intercept of the original function is \( (8, 0) \).

Next, let's find the vertically dilated function. The vertically dilated function with a factor \( k = 6 \) is: \[ y = 6\left(\frac{1}{2}x - 4\right) \] Let's simplify this: \[ y = 6 \cdot \frac{1}{2}x - 6 \cdot 4 \] \[ y = 3x - 24 \]

Now we can find the x-intercept of the dilated function by setting \( y = 0 \) again: \[ 0 = 3x - 24 \] \[ 3x = 24 \] \[ x = \frac{24}{3} \] \[ x = 8 \]

So the x-intercept of the dilated function is also \( (8, 0) \).

In summary:

  • The original function has an x-intercept of \( (8, 0) \).
  • The dilated function has an x-intercept of \( (8, 0) \).

The correct response is: The original function has an x-intercept of (8, 0), and the dilated function has an x-intercept of (8, 0).