Math Problem Statement

The scatter plot shows the population P of a town (in thousands) t years after 2000. Which is the best linear equation to model the town's population from 2000 to 2010?

Solution

To find the best linear equation that models the population of the town from 2000 to 2010 based on the scatter plot, we need to determine the slope (rate of change) and y-intercept of the line that best fits the data.

Step 1: Identify two points from the graph

From the scatter plot, two clear points can be:

  • At t=0t = 0 (Year 2000), P(0)=1.12P(0) = 1.12 thousand.
  • At t=10t = 10 (Year 2010), P(10)=1.32P(10) = 1.32 thousand.

Step 2: Calculate the slope mm

The slope of a linear equation P(t)=mt+bP(t) = mt + b is given by:

m=ΔPΔt=P(10)P(0)100=1.321.12100=0.2010=0.02m = \frac{\Delta P}{\Delta t} = \frac{P(10) - P(0)}{10 - 0} = \frac{1.32 - 1.12}{10 - 0} = \frac{0.20}{10} = 0.02

So, the slope m=0.02m = 0.02.

Step 3: Identify the y-intercept bb

The y-intercept bb is the population at t=0t = 0, which is 1.12.

Step 4: Form the equation

The equation of the line is:

P(t)=0.02t+1.12P(t) = 0.02t + 1.12

Conclusion:

The correct linear equation that models the town's population from 2000 to 2010 is: P(t)=0.02t+1.12P(t) = 0.02t + 1.12

This matches the second option from the given choices.

Would you like a more detailed explanation of any step? Here are some related questions you might want to explore:

  1. What is the importance of finding the slope in a linear equation?
  2. How does the y-intercept relate to real-world data in this context?
  3. What are the units of the slope in this problem?
  4. How would the equation change if the growth rate were faster?
  5. How could we model the population beyond 2010 with this equation?

Tip: When analyzing scatter plots, always identify two clear points to calculate the slope accurately.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Slope-Intercept Form

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