Creating an Increasing Function: Do Points (x1, y1) and (x2, y2) Qualify?

Increasing Functions with Two Given Points

Is it possible to create an increasing function with the two given points?

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Can we create an increasing function from 2 points?
00:03 Let's complete the points for the graph
00:11 We can see that the function is increasing
00:14 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

Is it possible to create an increasing function with the two given points?

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Step-by-step solution

Given two points A A and B B on a plane, we need to determine if a function can pass through these points such that it is increasing.

Consider the definition of an increasing function: For the function to be increasing, if x2>x1 x_2 > x_1 , then it must satisfy y2>y1 y_2 > y_1 .

Let's apply this to the problem:

  • Let the first point be A=(x1,y1) A = (x_1, y_1) and the second point be B=(x2,y2) B = (x_2, y_2) .
  • The function is increasing between these two points if x2>x1 x_2 > x_1 and y2>y1 y_2 > y_1 .

From the information provided, since the graph indicates that the point corresponding to B B is vertically above A A , it follows that:

  • The x x -coordinates are ordered such that x2>x1 x_2 > x_1 .
  • The y y -coordinates satisfy y2>y1 y_2 > y_1 .

Both necessary conditions hold, so it is indeed possible to create an increasing function passing through these two points.

Therefore, the answer to the problem is Yes.

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Final Answer

Yes

Key Points to Remember

Essential concepts to master this topic
  • Definition: Increasing function requires x2>x1 x_2 > x_1 implies y2>y1 y_2 > y_1
  • Technique: Compare coordinates: if right point is higher, function can be increasing
  • Check: Verify both x and y coordinates follow increasing pattern ✓

Common Mistakes

Avoid these frequent errors
  • Confusing increasing with positive slope only
    Don't think a function is increasing just because it goes up somewhere = wrong analysis! A function can decrease in some parts and still have increasing sections. Always check if when x increases, y also increases throughout the entire interval.

Practice Quiz

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Is the function in the graph decreasing? yx

FAQ

Everything you need to know about this question

What exactly makes a function increasing?

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A function is increasing if whenever you move to the right (larger x-values), the function values also get larger. In math terms: if x1<x2 x_1 < x_2 , then f(x1)<f(x2) f(x_1) < f(x_2) .

Can any two points create an increasing function?

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Yes, if the right point is higher! As long as the point with the larger x-coordinate also has the larger y-coordinate, you can always draw an increasing function through them.

What if the points have the same x-coordinate?

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If both points have the same x-coordinate, you cannot create a function at all! Functions require each x-value to have exactly one y-value.

Does the function have to be a straight line?

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No! The function can be curved, wavy, or any shape as long as it never decreases. You could draw a curve, exponential function, or many other increasing functions through the two points.

How do I tell from a graph if points can make an increasing function?

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Look at the points from left to right. If each point you encounter is higher than (or at the same height as) the previous point, then an increasing function is possible.

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