Math Problem Statement

Write the linear equation that gives the rule for this table. The table includes the following x and y values: (5, -22), (6, -34), (7, -46), (8, -58).

Solution

To write the linear equation that represents the data in the table, we need to determine the relationship between xx and yy. Here's the table provided:

xxyy
5-22
6-34
7-46
8-58

Step 1: Find the slope (rate of change)

The formula for the slope (mm) between two points (x1,y1)(x_1, y_1) and (x2,y2)(x_2, y_2) is: m=y2y1x2x1m = \frac{y_2 - y_1}{x_2 - x_1}

Using the points (5,22)(5, -22) and (6,34)(6, -34): m=34(22)65=34+221=121=12m = \frac{-34 - (-22)}{6 - 5} = \frac{-34 + 22}{1} = \frac{-12}{1} = -12

So, the slope is 12-12.

Step 2: Find the y-intercept (bb)

The general form of a linear equation is: y=mx+by = mx + b We can use one of the points, say (5,22)(5, -22), and the slope m=12m = -12 to solve for bb.

22=(12)(5)+b-22 = (-12)(5) + b 22=60+b-22 = -60 + b b=22+60=38b = -22 + 60 = 38

Step 3: Write the equation

Now that we have m=12m = -12 and b=38b = 38, the equation is: y=12x+38y = -12x + 38

Thus, the linear equation that gives the rule for this table is: y=12x+38y = -12x + 38

Would you like any further details or clarifications?

Here are five related questions to deepen your understanding:

  1. How would the equation change if the slope were positive instead of negative?
  2. How can you check if a set of points follows a linear pattern using a graph?
  3. What does the slope of a line represent in real-world scenarios?
  4. How can you determine the y-intercept just by looking at a graph?
  5. What is the significance of the y-intercept in different types of linear equations?

Tip: When writing a linear equation, always verify both the slope and y-intercept by substituting a point from the table back into the equation.

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Slope
y-intercept

Formulas

Slope formula: (y2 - y1) / (x2 - x1)
Linear equation: y = mx + b

Theorems

Slope-Intercept Form

Suitable Grade Level

Grade 8