Constant Function Analysis: Evaluating Data Table {0,3}, {1,4}, {2,8}

Constant Functions with Table Analysis

Determine whether the data in the following table represent a constant function

XY012348

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Does the following table represent a function?
00:03 A function has a constant slope, constant difference between Y values
00:07 Let's look at the differences between Y values and try to find the slope
00:10 The differences vary, the slope is not constant, therefore it's not a function
00:14 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

Determine whether the data in the following table represent a constant function

XY012348

2

Step-by-step solution

It is important to remember that a constant function describes a situation where as the X value increases, the function value (Y) remains constant.

In the table, we can observe that there is a constant change in X values, meaning an increase of 1, and a non-constant change in Y values - sometimes increasing by 1 and sometimes by 4

Therefore, according to the rule, the table does not describe a function

3

Final Answer

No

Key Points to Remember

Essential concepts to master this topic
  • Definition: Constant functions have same Y value for all X values
  • Technique: Check Y column: 3, 4, 8 shows increasing values
  • Verification: If Y values differ (3≠4≠8), function is not constant ✓

Common Mistakes

Avoid these frequent errors
  • Confusing constant change in X with constant function
    Don't think constant X increases mean constant function = wrong conclusion! The X values changing by +1 each time doesn't matter for constant functions. Always check if ALL Y values are identical, not the X pattern.

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

What exactly makes a function constant?

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A constant function means the Y value (output) stays exactly the same no matter what X value (input) you use. Think of it like y = 5 where every point has height 5.

Why doesn't the regular pattern in X values matter?

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The X values can follow any pattern - what matters is the Y values! Even if X goes 0, 1, 2 perfectly, if Y changes from 3 to 4 to 8, it's not constant.

How do I quickly check if a table shows a constant function?

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Look at the Y column only. Are all the numbers identical? If yes = constant function. If any number is different = not constant. It's that simple!

What would this table look like if it WAS a constant function?

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The table would show something like: X values 0, 1, 2 and Y values all the same, like 3, 3, 3 or 5, 5, 5. Every Y must be identical!

Can a constant function have different X values?

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Absolutely! The X values can be anything - 0, 1, 2 or even -5, 10, 100. Only the Y values must all be the same for it to be constant.

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