Polynomial System
1. State the problem: Solve the system of equations below.
$$3x^5 - x y = 0$$
$$2y - 5x = 1$$
2. Factor the first equation to relate $x$ and $y$.
From $$3x^5 - x y = 0$$ factor out $x$ to obtain $x(3x^4 - y) = 0$.
This gives two cases: $x = 0$ or $y = 3x^4$.
3. Case 1: $x = 0$.
Substitute $x = 0$ into $2y - 5x = 1$ to get $2y = 1$ and hence $y = 1/2$.
So one solution is $(0, 1/2)$.
4. Case 2: $y = 3x^4$.
Substitute into $2y - 5x = 1$ to get $2(3x^4) - 5x = 1$ which simplifies to $6x^4 - 5x - 1 = 0$.
5. Solve $6x^4 - 5x - 1 = 0$.
Test $x = 1$ and find $6(1)^4 - 5(1) - 1 = 0$, so $x = 1$ is a root.
Divide $6x^4 - 5x - 1$ by $x - 1$ to get $(x - 1)(6x^3 + 6x^2 + 6x + 1) = 0$.
6. Solve $6x^3 + 6x^2 + 6x + 1 = 0$ for real roots.
The derivative $18x^2 + 12x + 6$ is always positive, so the cubic is strictly increasing and has exactly one real root.
Using Newton's method (or a numerical solver) gives the real root approximately $x\approx -0.1981506$.
The corresponding $y$ is $y = 3x^4 \approx 0.00462498$.
7. Collect the real solutions.
The real solutions of the original system are $(0, 1/2)$, $(1, 3)$, and $(-0.1981506, 0.00462498)$.
Final answer: $(0, 1/2), (1, 3), (-0.1981506, 0.00462498)$.