Math Problem Statement

Which statement is true: The y-value of Function A when x = 6 is greater than the y-value of Function B when x = 6, or The y-value of Function A when x = 6 is less than the y-value of Function B when x = 6?

Solution

Let's analyze the problem step by step:

We have two linear functions, Function A and Function B:

  • Function A is represented by a table of values:
xy
-6-10
-3-5
915
  • Function B is given by the equation y=43x3y = \frac{4}{3}x - 3.

The question asks about the y-values of both functions when x=6x = 6.

1. Determine the equation for Function A:

We need to find the equation for Function A. Since it is a linear function, we can calculate its slope (mm) using two points from the table. Let's use the points (6,10)(-6, -10) and (3,5)(-3, -5).

The formula for the slope is: m=y2y1x2x1=5(10)3(6)=5+103+6=53m = \frac{y_2 - y_1}{x_2 - x_1} = \frac{-5 - (-10)}{-3 - (-6)} = \frac{-5 + 10}{-3 + 6} = \frac{5}{3}

So, the slope of Function A is 53\frac{5}{3}.

Now, let's use the point-slope form of the line equation to find the full equation. Using the point (3,5)(-3, -5): yy1=m(xx1)y - y_1 = m(x - x_1) y(5)=53(x(3))y - (-5) = \frac{5}{3}(x - (-3)) y+5=53(x+3)y + 5 = \frac{5}{3}(x + 3) Expanding: y+5=53x+5y + 5 = \frac{5}{3}x + 5 y=53xy = \frac{5}{3}x Thus, the equation of Function A is y=53xy = \frac{5}{3}x.

2. Find the y-value of Function A when x=6x = 6:

Using the equation y=53xy = \frac{5}{3}x: y=53×6=10y = \frac{5}{3} \times 6 = 10 So, when x=6x = 6, the y-value of Function A is 10.

3. Find the y-value of Function B when x=6x = 6:

Using the equation y=43x3y = \frac{4}{3}x - 3: y=43×63=83=5y = \frac{4}{3} \times 6 - 3 = 8 - 3 = 5 So, when x=6x = 6, the y-value of Function B is 5.

4. Conclusion:

When x=6x = 6, the y-value of Function A is 10, and the y-value of Function B is 5. Therefore, the correct statement is:

"The y-value of Function A when x = 6 is greater than the y-value of Function B when x = 6."

Let me know if you'd like further details or have any questions! Here are some related questions to expand on:

  1. What is the significance of slope in a linear equation?
  2. How can you determine the y-intercept from a table of values?
  3. What does it mean for two linear functions to have the same slope?
  4. How do you graph a linear function from its equation?
  5. What is the relationship between the slope and the rate of change?

Tip: When finding the equation of a line from a table, always use the slope formula and a known point to derive the equation.

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Math Problem Analysis

Mathematical Concepts

Linear functions
Slope
Linear equations

Formulas

Slope formula: m = (y2 - y1) / (x2 - x1)
Equation of a line: y = mx + b
Function B: y = (4/3)x - 3

Theorems

Slope-intercept form of a linear equation

Suitable Grade Level

Grades 7-9