Circle a equation in a straight line

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SUMMARY

The discussion centers on identifying and categorizing equations as straight lines or parabolas. The equations provided include three straight lines: y = 2x - 1, x - y = 1, and x = y + 5, and two parabolas: y = x^2 + 2 and y = -x^2 + 5. Participants clarify that the term "circle an equation" likely refers to highlighting or encircling the equations that represent straight lines. The key takeaway is that only equations without exponents on the variables represent straight lines.

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Abdullah Qureshi
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how to circle a equation in a straight line
y= 2x-1
y = x^2+ 2
x –y = 1
x = y + 5
y = – x^2 + 5

pls help me
 
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You’ve posted the equations for three lines and two parabolas.
I have no idea what you are asking with regard to a circle.
Please translate the original problem to English and post it.

D2FA1FE9-2AF0-4A44-8E5B-E1DD3C205955.png
 
skeeter said:
You’ve posted the equations for three lines and two parabolas.
I have no idea what you are asking with regard to a circle.
Please translate the original problem to English and post it.

https://www.physicsforums.com/attachments/11038
Can you without the graph
 
Do what?
 
Are you asking which of the five equations are lines?
 
Abdullah Qureshi said:
how to circle a equation in a straight line
I don't understand what "to circle an equation in a straight line".
means.

y= 2x-1
This is the equation of a straight line.

y = x^2+ 2
This is the equation of a parabola.

x –y = 1
This is the equation of a straight line.

x = y + 5
This is the equation of a straight line.

y = – x^2 + 5
This is the equation of a parabola.

pls help me
There are NO circles.
 
It possibly means to encircle the equations forming straight lines.
 
skeeter said:
Do what?
Without making a graph. It can be use as simple way like trigonometry
 
Straight-line equations, or "linear" equations, graph as straight lines, and have simple variable expressions with no exponents on them. If you see an equation with only x and y, then you're dealing with a straight-line equation. As opposed to, say x² or √x .
The second and the last equations posted above have exponents, so they are not forming straight lines. The rest of them are. You can encircle the rest!
 
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