Math Problem Statement

Here is a table of values for a linear relationship (straight line). Use the table to find the equation of the line in the form \( y = mx + c \). | x | -2 | 0 | 2 | 4 | |---|----|---|---|---| | y | -10| -4| 2 | 8 |

Solution

To find the equation of the line y=mx+cy = mx + c that fits the data in the table, we need to determine both the slope mm and the y-intercept cc.

Step 1: Find the Slope mm

The slope mm for a line is calculated as: m=ΔyΔx=y2y1x2x1m = \frac{\Delta y}{\Delta x} = \frac{y_2 - y_1}{x_2 - x_1}

Using two points from the table, such as (2,10)(-2, -10) and (0,4)(0, -4): m=4(10)0(2)=4+102=62=3m = \frac{-4 - (-10)}{0 - (-2)} = \frac{-4 + 10}{2} = \frac{6}{2} = 3

So, m=3m = 3.

Step 2: Find the Y-Intercept cc

To find cc, we can use the slope-intercept form y=mx+cy = mx + c and substitute one of the points from the table. Using (0,4)(0, -4): 4=30+c-4 = 3 \cdot 0 + c c=4c = -4

Conclusion

The equation of the line is: y=3x4y = 3x - 4

Would you like further clarification or have any additional questions?

Here are some related questions to expand your understanding:

  1. How would the equation change if the slope were negative?
  2. How can we verify if other points lie on this line using the equation?
  3. What would be the interpretation of the y-intercept in a real-world context?
  4. How does the line’s equation change if we shift the line up by 2 units?
  5. How can we rewrite this equation in standard form?

Tip: To find the slope quickly, use two points with simple values for easy calculation.

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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 + c

Theorems

Linear Equation Theory

Suitable Grade Level

Grades 8-10