Math Problem Statement

Write the linear equation that gives the rule for this table: | x | y | |---|---| | 2 | 1 | | 3 | 2 | | 4 | 3 | | 5 | 4 | Write your answer as an equation with y first, followed by an equals sign.

Solution

To solve this problem, we need to find the linear equation that fits the data points in the table. The equation will be in the slope-intercept form, y=mx+by = mx + b, where:

  • mm is the slope.
  • bb is the y-intercept.

Step 1: Identify two points from the table.

The table gives the following points:

  • (2, 1)
  • (3, 2)
  • (4, 3)
  • (5, 4)

Step 2: Calculate the slope mm.

The slope is calculated as:

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

Let's use the points (2, 1) and (3, 2):

m=2132=11=1m = \frac{{2 - 1}}{{3 - 2}} = \frac{1}{1} = 1

So, the slope m=1m = 1.

Step 3: Find the y-intercept bb.

Now that we know m=1m = 1, we can use one of the points to find the y-intercept. Let's use the point (2, 1) and substitute into the equation y=mx+by = mx + b:

1=1(2)+b1 = 1(2) + b

Solving for bb:

1=2+bb=12=11 = 2 + b \quad \Rightarrow \quad b = 1 - 2 = -1

Step 4: Write the equation.

Now that we have m=1m = 1 and b=1b = -1, the equation is:

y=x1y = x - 1

This is the linear equation that fits the data from the table.


Do you want more details or have any questions?

Here are five related questions to explore:

  1. How would you find the equation if the points in the table had a negative slope?
  2. What happens to the equation if you change the y-intercept?
  3. How can you verify that a given equation fits all the points in a table?
  4. How does the slope influence the steepness of a line?
  5. What would be the equation if the slope was zero?

Tip: Always double-check your slope calculation by using multiple points to ensure consistency.

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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 7-8