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Irina18 [472]
3 years ago
7

Which graph represents the parametric equations x = t^2 + 2t and y = –t, where –4 ≤ t ≤ 1?

Mathematics
2 answers:
Artist 52 [7]3 years ago
8 0

Answer:

The answer is A

Step-by-step explanation:

cuz math lol

Alex73 [517]3 years ago
5 0

Answer:

We have:

x = t^2 + 2*t

y = -t

where:

–4 ≤ t ≤ 1

Isolating t in the "y" equation, we get:

t = -y

Now we can use the limits of t, to find similar limits for y.

When t = -4

-4 = -y

4 = y

when t = 1

1 = -y

-1 = y

Then the limits for y are:

-1 < y < 4

Now, knowing that t = -y

we can replace that in the "x" equation:

x = t^2 + 2*t

x = (-y)^2 + 2*(-y)

x = y^2 - 2*y

Then the graph of the parametric equation is the one defined by:

x = y^2 - 2*y

in the range

-1 < y < 4

The graph of this can be seen below, where the two black dots are the points where the graph should start/end.

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