Math Problem Statement

A linear function f has the ordered pairs listed in the table. Find the slope m of the graph of f, use the table to find the y-intercept of the line, and give an equation that defines f.

Solution

We are asked to find the slope mm of the linear function ff, use the table to find the yy-intercept, and give an equation that defines ff.

The table gives the following points:

(6,23),(4,15),(2,7),(0,1),(2,9)(-6, -23), (-4, -15), (-2, -7), (0, 1), (2, 9)

Step 1: Find the slope mm

The formula for the slope between two points (x1,y1)(x_1, y_1) and (x2,y2)(x_2, y_2) is:

m=y2y1x2x1m = \frac{y_2 - y_1}{x_2 - x_1}

Using the points (6,23)(-6, -23) and (4,15)(-4, -15):

m=15(23)4(6)=15+234+6=82=4m = \frac{-15 - (-23)}{-4 - (-6)} = \frac{-15 + 23}{-4 + 6} = \frac{8}{2} = 4

So, the slope m=4m = 4.

Step 2: Find the y-intercept

The y-intercept occurs when x=0x = 0. From the table, when x=0x = 0, f(x)=1f(x) = 1. Therefore, the y-intercept is 11.

Step 3: Write the equation of the line

The general equation of a line is:

f(x)=mx+bf(x) = mx + b

We already know m=4m = 4 and the y-intercept b=1b = 1. So the equation of the line is:

f(x)=4x+1f(x) = 4x + 1

Final Answer:

  • Slope m=4m = 4
  • Y-intercept = 1
  • The equation of the line is f(x)=4x+1f(x) = 4x + 1.

Would you like more details or have any further questions?

Here are 5 related questions:

  1. How do you find the slope using two different points?
  2. What is the significance of the y-intercept in a linear equation?
  3. Can you verify the equation by plugging in other values from the table?
  4. How does changing the slope affect the steepness of a line?
  5. What happens to the graph of the line if the y-intercept changes?

Tip: Always check the equation by substituting different points from the table to ensure the accuracy of the equation.

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Slope-Intercept Form
Coordinate Geometry

Formulas

Slope formula: m = (y2 - y1) / (x2 - x1)
Slope-intercept form: y = mx + b

Theorems

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Suitable Grade Level

Grades 8-10