Identify the Equation: Matching Functions to Table Data

Linear Functions with Table Analysis

Which of the following equations corresponds to the function represented in the table?

XY-2024601234

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find the appropriate equation for the function in the table
00:03 We want to find the slope of the graph
00:06 We'll use the formula to find the function graph's slope
00:11 We'll substitute appropriate values according to the given data and solve to find the slope
00:21 This is the slope of the graph
00:30 We'll use the linear equation
00:34 We'll substitute appropriate values and solve for B
00:44 This is the value of B
00:49 We'll construct the linear equation using the values we found
00:54 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Which of the following equations corresponds to the function represented in the table?

XY-2024601234

2

Step-by-step solution

To determine the corresponding equation for the given table, follow these steps:

  • Step 1: Confirm the linearity of the data by calculating the slope, m m , using consecutive data points:
    - Between points (2,0) (-2, 0) and (0,1) (0, 1) , the slope is m=100(2)=12 m = \frac{1 - 0}{0 - (-2)} = \frac{1}{2} .
    - Between points (0,1) (0, 1) and (2,2) (2, 2) , the slope is m=2120=12 m = \frac{2 - 1}{2 - 0} = \frac{1}{2} .
    - Confirm the same slope m=12 m = \frac{1}{2} for remaining pairs (2,2) (2, 2) and (4,3) (4, 3) , (4,3) (4, 3) and (6,4) (6, 4) .
  • Step 2: Use one point, such as (0,1) (0, 1) , to find the y-intercept, b b , knowing the slope m=12 m = \frac{1}{2} :
    - Use the slope-intercept form: y=mx+b y = mx + b . Substituting (0,1) (0, 1) , gives 1=12(0)+b 1 = \frac{1}{2}(0) + b , implying b=1 b = 1 .
  • Step 3: Formulate the equation: Given m=12 m = \frac{1}{2} and b=1 b = 1 , the linear function is:
    - y=12x+1 y = \frac{1}{2}x + 1 .
  • Step 4: Compare with provided choices:

The equation y=12x+1 y = \frac{1}{2}x + 1 matches choice 4. Therefore, the correct equation corresponding to the table is y=12x+1 y = \frac{1}{2}x + 1 .

3

Final Answer

y=12x+1 y=\frac{1}{2}x+1

Key Points to Remember

Essential concepts to master this topic
  • Slope Formula: Use consecutive points to calculate rise over run
  • Technique: Calculate slope m=100(2)=12 m = \frac{1-0}{0-(-2)} = \frac{1}{2} between points
  • Check: Verify equation works for all table points: y=12(2)+1=2 y = \frac{1}{2}(2) + 1 = 2

Common Mistakes

Avoid these frequent errors
  • Using only one pair of points to find slope
    Don't calculate slope from just one pair like (-2,0) and (6,4) = might miss calculation errors! This can lead to wrong slope values. Always verify slope consistency by checking at least 2-3 different point pairs from the table.

Practice Quiz

Test your knowledge with interactive questions

Determine whether the following table represents a constant function:

XY02468-3-3-3-3-3

FAQ

Everything you need to know about this question

How do I know which two points to use for finding slope?

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You can use any two points from the table! For linear functions, the slope is constant. However, using consecutive points often makes calculations easier and helps catch errors.

What if I get different slopes from different point pairs?

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If you get different slopes, the function is not linear! Double-check your calculations. For linear functions, all point pairs must give the same slope.

How do I find the y-intercept from a table?

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Look for the point where x = 0. In this table, when x = 0, y = 1, so the y-intercept is 1. If x = 0 isn't in the table, use y=mx+b y = mx + b with any point.

Can I check my equation without substituting every point?

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It's best to check at least 2-3 points from the table. This helps catch calculation errors and confirms your equation is correct. Always include the y-intercept point if available!

What does slope-intercept form tell me about the function?

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The equation y=mx+b y = mx + b shows: m is the slope (how steep the line is) and b is where the line crosses the y-axis. Here, m=12 m = \frac{1}{2} means the line rises 1 unit for every 2 units right.

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