Math Problem Statement

Find the equation of the linear function represented by the table below in slope-intercept form.

Solution

To find the equation of the linear function in slope-intercept form (y=mx+by = mx + b) using the given table, we follow these steps:

Step 1: Find the slope (mm)

The slope (mm) is the rate of change of yy with respect to xx. Use the formula:

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

Select two points from the table, such as (1,2)(-1, -2) and (2,10)(2, 10):

m=10(2)2(1)=10+22+1=123=4m = \frac{10 - (-2)}{2 - (-1)} = \frac{10 + 2}{2 + 1} = \frac{12}{3} = 4

Step 2: Solve for the y-intercept (bb)

Using the slope (m=4m = 4) and one point, substitute into y=mx+by = mx + b. Use the point (2,10)(2, 10):

10=4(2)+b10 = 4(2) + b

10=8+b    b=210 = 8 + b \implies b = 2

Step 3: Write the equation

Substitute m=4m = 4 and b=2b = 2 into y=mx+by = mx + b:

y=4x+2y = 4x + 2

Final Answer:

The equation of the linear function is:

y=4x+2y = 4x + 2

Let me know if you want further details or have any questions!


Here are 5 related questions to explore:

  1. How can you verify the slope using different pairs of points from the table?
  2. How does changing one of the yy-values in the table affect the equation of the line?
  3. What would the graph of y=4x+2y = 4x + 2 look like?
  4. Can you find the xx-intercept of the line?
  5. How can this method be extended to find the equation of a nonlinear function?

Tip: Always double-check your slope calculation using multiple pairs of points to confirm consistency.

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Math Problem Analysis

Mathematical Concepts

Linear Functions
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