Solving Direct Variation Problem: 1-y = 2x

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Discussion Overview

The discussion revolves around determining whether the equation 1 - y = 2x represents a direct variation. Participants are seeking clarification on the concept of direct variation and how to apply it to the given equation.

Discussion Character

  • Conceptual clarification
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant expresses frustration and confusion about how to approach the problem, indicating a lack of understanding of the concept of direct variation.
  • Another participant defines direct variation as a relationship where two variables increase or decrease together at a constant rate, prompting questions about the relationship between x and y in the context of the equation.
  • A third participant emphasizes the importance of understanding the definition of direct variation and suggests examining specific values of x to see if y behaves accordingly.
  • Further questions are posed regarding the values of y when x is set to specific numbers, challenging others to explore whether y doubles when x doubles.
  • Some participants request additional help and clarification on how to start solving the problem, indicating a desire for more guidance on the application of the concept.

Areas of Agreement / Disagreement

Participants generally agree on the need to understand the definition of direct variation, but there is no consensus on how to apply this understanding to the specific equation presented. Multiple viewpoints on how to approach the problem remain evident.

Contextual Notes

Participants have not yet resolved how to interpret the equation in terms of direct variation, and there are missing assumptions regarding the relationship between x and y that have not been fully explored.

Hayabusa
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I am having a lot of difficulty with this problem . I don't have the slightest idea on how to do this problem and my textbook does not explain it. Please help me:


Determine whether 1 - y = 2x is a direct variation. If so explain.


This problem has me stumpted and very frustrated. :confused:
 
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A relationship between two variables such that the data increase or decrease together at a constant rate is called direct variation.

When x increases or decreases, what happens to y?
Is there a constant relationship between x and y?
 
It never ceases to amaze me that people think they should be able to do a problem in which they don't know what the key words mean.

The whole point of this question is the definition "direct variation". As whozum said "A relationship between two variables such that the data increase or decrease together at a constant rate is called direct variation.
(I emphasized the crucial part.)

Whozum then asks "When x increases or decreases, what happens to y?
Is there a constant relationship between x and y?". I'll be more specific: when x= 1 what is y? When x doubles to 2, what is y? Did y also double? Is this "direct variation"?
 
I don't mean to be a pest, but I still do not comprehend how to do this problem. Can I get a little more help. :redface:
 
Start by answering as many of the questions I asked as you can!
 
I know what the words mean, I just don't know how to solve the problem. I read the same definitions in the chapter. But the book doesn't show me how to solve the problem. If you can be so kind and help me start the problem I'd appreciate it.
 
Alright, I'll give you one more chance!
Answer these questions:
What is f(1)?

What is f(2)?

2 is exactly twice 1. Is f(2) exactly twice f(1)?
 

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