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#1 2008-09-13 08:40:27
- Danbee
- Member
- Registered: 2008-08-28
- Posts: 21
parametric equation
Find a set of parametric equations that represents the graph of y=√ x+4, using the parameter t=1+x/4
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#2 2008-09-13 10:21:17
- mathsyperson
- Moderator
- Registered: 2005-06-22
- Posts: 4,900
Re: parametric equation
Make x the subject of its equation first:
t = 1 + x/4
t-1 = x/4
x = 4(t-1)
Then substitute that into the y equation to get y in terms of t.
y = √(x+4)
y = √(4(t-1)+4)
y = √(4t)
y = 2√t
Why did the vector cross the road?
It wanted to be normal.
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