Help on Parametric Equations


by mymachine
Tags: equations, parametric
mymachine
mymachine is offline
#1
Feb17-13, 03:28 PM
P: 42
If x = t, y = 2t, and y ≠ f(x), how to graph these equations?
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mfb
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#2
Feb17-13, 03:38 PM
Mentor
P: 10,853
Plot a point for every t.
Alternatively, calculate y=f(x).
mathman
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#3
Feb17-13, 03:39 PM
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Your condition y ≠ f(x) doesn't make sense. The definitions you give for x and y imply y = 2x, which is easily graphed.

mymachine
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#4
Feb18-13, 01:04 AM
P: 42

Help on Parametric Equations


Quote Quote by mathman View Post
Your condition y ≠ f(x) doesn't make sense. The definitions you give for x and y imply y = 2x, which is easily graphed.
In this case, y is ≠ f(x).
jbriggs444
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#5
Feb18-13, 07:17 AM
P: 754
Quote Quote by mymachine View Post
In this case, y is ≠ f(x).
Possibly what you mean to say is that no function has been given for y in terms of x.

In some cases it is true that no function exists for y in terms of x. This would be because there are some values of x that pair up with more than one value for y. However, in the case at hand, it is trivial to find an f() such that y = f(x).
mathman
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#6
Feb18-13, 03:45 PM
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P: 5,941
Quote Quote by mymachine View Post
In this case, y is ≠ f(x).
f(x) = 2x. What does your assertion mean?
phion
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#7
Feb18-13, 04:07 PM
PF Gold
phion's Avatar
P: 47
Maybe he meant for y ≠ t?


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