New Origin 7696E9
1. **State the problem:** We have the equation $$2x^2 - 3xy - y^2 + x - 5y - 3 = 0$$ and want to translate the origin to a point $ (h,k) $ so that the new equation has no first degree terms in $x$ or $y$.
2. **Formula and approach:** When translating the origin to $ (h,k) $, substitute $$x = X + h$$ and $$y = Y + k$$ into the equation. The new equation in terms of $X$ and $Y$ will have no linear terms if the coefficients of $X$ and $Y$ vanish.
3. **Substitute and expand:**
$$2(X+h)^2 - 3(X+h)(Y+k) - (Y+k)^2 + (X+h) - 5(Y+k) - 3 = 0$$
Expanding:
$$2(X^2 + 2hX + h^2) - 3(XY + Xk + hY + hk) - (Y^2 + 2kY + k^2) + X + h - 5Y - 5k - 3 = 0$$
4. **Group terms:**
Quadratic terms:
$$2X^2 - 3XY - Y^2$$
Linear terms:
$$2 imes 2hX - 3(Xk + hY) + X - 5Y = (4h - 3k + 1)X + (-3h - 2k - 5)Y$$
Constant terms:
$$2h^2 - 3hk - k^2 + h - 5k - 3$$
5. **Set linear coefficients to zero:**
$$4h - 3k + 1 = 0$$
$$-3h - 2k - 5 = 0$$
6. **Solve the system:**
From the first:
$$4h = 3k - 1$$
$$h = \frac{3k - 1}{4}$$
Substitute into second:
$$-3\left(\frac{3k - 1}{4}\right) - 2k - 5 = 0$$
Multiply both sides by 4:
$$-3(3k - 1) - 8k - 20 = 0$$
$$-9k + 3 - 8k - 20 = 0$$
$$-17k - 17 = 0$$
$$-17k = 17$$
$$k = -1$$
Substitute back:
$$h = \frac{3(-1) - 1}{4} = \frac{-3 - 1}{4} = \frac{-4}{4} = -1$$
7. **Answer:** The new origin is at $$\boxed{(-1, -1)}$$ where the equation has no first degree terms.