Equations & Graphs Homework: Draw y=8-2x

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Homework Help Overview

The discussion revolves around the task of graphing the linear equation y = 8 - 2x, with references to another equation, y = (4/5)2^x. Participants are exploring how to relate these two equations in the context of graphing.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • Participants discuss the need to plot points for the linear equation and question the clarity of the original equation provided. There are attempts to clarify the relationship between the two equations and how to derive coordinates for graphing.

Discussion Status

The discussion is ongoing, with some participants providing guidance on plotting points for the linear equation. There is a lack of consensus on the interpretation of the original equation, leading to further questions about its meaning and relevance to the task at hand.

Contextual Notes

There are uncertainties regarding the original equation's format and whether it was intended to be a multiplication or a different expression. The participants are also navigating the implications of homework rules and the need for clarity in the equations being discussed.

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Homework Statement



I have been given this equation : 4/5 X 2^x
I have drawn the graph.


Now, I was asked to draw the graph of y = 8 – 2x by using the 1st equation above.

Can you help me in doing so? I know that the 1st Co-ordinates is (0,8) how can I find the other co-ordinate to draw the line?
 
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There isn't any need to use that graph to graph y=8-2x. This is just a line. Plot two points. Then draw a line through them.

Also, don't use X for multiplication. Ever. :)
 
What you have written isn't an equation; there is no = sign. And it also isn't clear what it means. Is the X supposed to be multiplication? Is it supposed to be (4/5)2x? Where is the y?
 
The only way this problem makes any sense is if the second equation is y = 8 - 2x. In that case, you can look at the graph of this equation as being some transformations of the graph of y = (4/5)2x.
 
Sorry the 1st equation was y= (4/5)2^x

The 1st Co-ordinates are (0,8) since the y-intercept is 8 but I don't know how to find the 2nd Coordinates (x,y)
 
What about the second equation? Is it y = 8 - 2x or y = 8 - 2x?
 
Mark44 said:
What about the second equation? Is it y = 8 - 2x or y = 8 - 2x?

Good catch.
 
The 2nd equation is y = 8 - 2x
 
Then this problem makes no sense.
DarkPhoenix said:
have been given this equation : 4/5 X 2^x
I have drawn the graph.

Now, I was asked to draw the graph of y = 8 – 2x by using the 1st equation above.
 

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