Determine the Equation from the Table: Function Matching Challenge

Linear Functions with Table Analysis

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

XY-3-1135-20246

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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
00:07 We'll use the formula to find the slope of a function graph
00:10 We'll substitute appropriate values according to the data and solve to find the slope
00:19 This is the slope of the graph
00:28 Let's take a point on the graph
00:33 We'll use the straight line equation
00:36 We'll substitute appropriate values and solve to find B
00:45 This is the value of B (intersection point with Y-axis)
00:51 Let's compose the straight line equation using the values we found
00:56 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-3-1135-20246

2

Step-by-step solution

To solve this problem, follow these steps:

  • Step 1: Analyze the pattern of the given table. Notice that the increase in Y Y for each increase of 2 in X X is 2, indicating a slope of 1.
  • Step 2: Choose a likely linear equation from the provided options.
  • Step 3: Verify which equation accurately represents all the data points.

Let's verify the equation y=x+1 y = x + 1 with all pairs:

  • For X=3 X = -3 , calculate Y=(3)+1=2 Y = (-3) + 1 = -2 . This matches the Y Y -value in the table.
  • For X=1 X = -1 , calculate Y=(1)+1=0 Y = (-1) + 1 = 0 . This too matches the Y Y -value.
  • For X=1 X = 1 , calculate Y=1+1=2 Y = 1 + 1 = 2 . Again, this matches.
  • For X=3 X = 3 , calculate Y=3+1=4 Y = 3 + 1 = 4 . This matches as well.
  • For X=5 X = 5 , calculate Y=5+1=6 Y = 5 + 1 = 6 . Finally, this matches too.

Each of the calculated Y Y -values using y=x+1 y = x + 1 aligns with the respective Y Y -values from the table.

Therefore, the correct equation that represents the function is y=x+1 y = x + 1 .

3

Final Answer

y=x+1 y=x+1

Key Points to Remember

Essential concepts to master this topic
  • Pattern Recognition: Find the constant rate of change between input-output pairs
  • Slope Calculation: Change in Y ÷ Change in X = 2÷2 = 1
  • Verification: Test each coordinate pair in your equation: (-3)+1 = -2 ✓

Common Mistakes

Avoid these frequent errors
  • Testing only one coordinate pair from the table
    Don't check just one point like (-3, -2) and assume the equation works = incomplete verification! One point can match multiple equations accidentally. Always test every single coordinate pair from the table in your chosen equation.

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 find the slope from a table?

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Pick any two points and use slope = (change in Y) ÷ (change in X). For example, from (-3, -2) to (-1, 0): slope = (0 - (-2)) ÷ (-1 - (-3)) = 2 ÷ 2 = 1.

What if multiple equations seem to work with one point?

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That's why you must test all points! For instance, y=x+4 y = x + 4 works for (-3, -2) but fails for (-1, 0). Only the correct equation works for every single point.

How do I know which form the equation should be in?

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Linear equations from tables are usually in slope-intercept form y=mx+b y = mx + b , where m is the slope and b is the y-intercept.

What if I can't find a pattern in the table?

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Look for consistent changes. In linear functions, when X increases by the same amount, Y should also change by the same amount each time. If X goes up by 2 and Y goes up by 2 each time, the slope is 1.

Can I use any two points to find the equation?

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Yes! Any two points from a linear function will give you the same slope. But remember to verify your equation with all the other points to make sure it's correct.

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