Math Problem Statement

A table of values of a linear function is shown below. Find the output when the input is n.

Solution

Let's analyze the table of values in the image.

We are given the following inputs and outputs for a linear function:

InputOutput
1-4
20
34
48
n?

To find the pattern, notice the output changes with a constant difference as the input increases by 1. Specifically:

  • From input 1 to input 2: 0(4)=40 - (-4) = 4
  • From input 2 to input 3: 40=44 - 0 = 4
  • From input 3 to input 4: 84=48 - 4 = 4

The output increases by 4 for every increase of 1 in the input, confirming this is a linear function with a constant rate of change.

Step 1: Determine the slope mm

The slope (rate of change) is 4, which means the linear function has the form:

y=4x+by = 4x + b

Step 2: Find the y-intercept bb

Using the point (1, -4):

4=4(1)+b    4=4+b    b=8-4 = 4(1) + b \implies -4 = 4 + b \implies b = -8

Thus, the equation of the linear function is:

y=4x8y = 4x - 8

Step 3: Calculate the output for input nn

The output when the input is nn is:

y=4n8y = 4n - 8

Thus, the output for the input nn is 4n84n - 8.

Would you like more details or clarifications? Here are some related questions to consider:

  1. How can you use two points to find the equation of a line?
  2. Why is the slope the same between any two consecutive points on a linear function?
  3. How do we determine the y-intercept from a table of values?
  4. Can this method be used for other types of functions (e.g., quadratic, exponential)?
  5. How do you apply this function to predict other outputs beyond those in the table?

Tip: Always check for a constant rate of change when analyzing tables of linear functions. It ensures the function is indeed linear.

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Math Problem Analysis

Mathematical Concepts

Linear Functions
Algebra
Slope-Intercept Form

Formulas

y = mx + b
Slope = (change in y) / (change in x)

Theorems

Slope-Intercept Form Theorem

Suitable Grade Level

Grades 7-9