The parametric equations x = t ^ 2 and y = t ^ 6 have the same graph as x = t ^ 3 and y = t ^ 9 .
Question:
The parametric equations x = t ^ 2 and y = t ^ 6 have the same graph as x = t ^ 3 and y = t ^ 9 .
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Asked by: Test User 100045
Created at: 2025-05-05 00:47:02
Asked by: Test User 100045
Created at: 2025-05-05 00:47:02
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Let's analyze the two pairs of parametric equations:
### First pair:
- \(x_1 = t^2\)
- \(y_1 = t^6\)
### Second pair:
- \(x_2 = t^3\)
- \(y_2 = t^9\)
You are asking if they **have the same graph** (i.e., describe the same curve in the \(xy\)-plane).
---
## Analyzing the relationship:
Let's find the relationship between \(x\) and \(y\) in both cases.
### First pair: \(x_1 = t^2,\, y_1 = t^6\)
Express \(y_1\) in terms of \(x_1\):
\[
y_1 = t^6 = (t^2)^3 = (x_1)^3
\]
So, the curve is **\(y = x^3\)**.
---
### Second pair: \(x_2 = t^3,\, y_2 = t^9\)
Express \(y_2\) in terms of \(x_2\):
\[
y_2 = t^9 = (t^3)^3 = (x_2)^3
\]
Again, the curve is **\(y = x^3\)**.
---
## Are the graphs exactly the same?
Let's check the possible subtleties:
- **Domain for \(x_1 = t^2\):** \(x_1 \geq 0\) for all real \(t\).
- So for the first pair, only the right half (\(x \geq 0\)) of the curve \(y = x^3\) is traced.
- **Domain for \(x_2 = t^3\):** \(x_2\) can be any real number (since \(t\) can be any real number).
- So the second pair traces the **entire curve** \(y = x^3\).
---
## **Conclusion**
**The two parametric equations do NOT have the same graph.**
- **First pair (\(x = t^2, y = t^6\))** traces only the part of \(y = x^3\) for \(x \geq 0\).
- **Second pair (\(x = t^3, y = t^9\))** traces the entire curve \(y = x^3\), for all real \(x\).
**In summary:**
> The parametric equations \(x = t^2\), \(y = t^6\) and \(x = t^3\), \(y = t^9\) **do not have the same graph**. The first only describes the right half (\(x \geq 0\)) of the curve \(y = x^3\), while the second describes the entire curve.
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