Math Problem Statement

This table of values represents a linear function. Which of the following equations represents the function?

Solution

Let's work through this step by step.

The table provided gives values for xx and yy, which represent points on the line. To find the equation of the linear function, we can calculate the slope mm using the formula for the slope between two points:

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

We can take two pairs of points from the table. Let's use (-5, 17) and (-2, 2):

m=2172(5)=153=5m = \frac{2 - 17}{-2 - (-5)} = \frac{-15}{3} = -5

So, the slope is m=5m = -5.

Next, we can use the slope-intercept form of a line, which is:

y=mx+by = mx + b

We know m=5m = -5. Now, to find the y-intercept bb, we substitute one of the points from the table into the equation. Let's use the point (-2, 2):

2=5(2)+b2 = -5(-2) + b 2=10+b2 = 10 + b b=210=8b = 2 - 10 = -8

So, the equation of the line is:

y=5x8y = -5x - 8

The correct answer is D) y=5x8y = -5x - 8.

Would you like more details or have any questions?

Here are 5 questions that expand on this:

  1. How do you determine the slope if the two points have the same x-coordinate?
  2. What happens if the points have the same y-coordinate? How does the slope change?
  3. Could we use a different pair of points from the table to verify the slope?
  4. How can you recognize a linear function just by looking at a table of values?
  5. What does the slope tell us about the relationship between xx and yy in this function?

Tip: When solving linear equations, always check two points to ensure the calculated slope is consistent.

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Math Problem Analysis

Mathematical Concepts

Linear Functions
Slope
Slope-Intercept Form

Formulas

m = (y2 - y1) / (x2 - x1)
y = mx + b

Theorems

Slope-Intercept Form Theorem

Suitable Grade Level

Grades 8-10