Solve the system of equation for $(x,y) \in \mathbb{R}$
$$\left\{\begin{matrix}
\sqrt{x^2+y^2}+\sqrt{(x-4)^2+(y-3)^2}=5\\
  3x^2+4xy=24
\end{matrix}\right.$$ \\
Explain your answer
1. **Analyzing the first equation:**
   \[
   \sqrt{x^2 + y^2} + \sqrt{(x-4)^2 + (y-3)^2} = 5
   \]
   This equation represents the sum of the distances from the point \((x, y)\) to the points \((0, 0)\) and \((4, 3)\). According to the definition of an ellipse, if the sum of the distances from any point on the ellipse to the two foci is constant, then the point lies on the ellipse. However, in this case, the sum of the distances is equal to the distance between the two points \((0, 0)\) and \((4, 3)\), which is:
   \[
   \sqrt{(4-0)^2 + (3-0)^2} = \sqrt{16 + 9} = 5
   \]
   Therefore, \((x, y)\) must lie on the line segment joining \((0, 0)\) and \((4, 3)\).

2. **Parameterizing the line segment:**
   Since \((x, y)\) lies on the line segment between \((0, 0)\) and \((4, 3)\), we can express \(y\) in terms of \(x\) using the slope of the line:
   \[
   \text{slope} = \frac{3 - 0}{4 - 0} = \frac{3}{4}
   \]
   Thus, the equation of the line is:
   \[
   y = \frac{3}{4}x
   \]

3. **Substituting \(y = \frac{3}{4}x\) into the second equation:**
   The second equation is:
   \[
   3x^2 + 4xy = 24
   \]
   Substituting \(y = \frac{3}{4}x\) into this equation, we get:
   \[
   3x^2 + 4x\left(\frac{3}{4}x\right) = 24
   \]
   Simplifying, we have:
   \[
   3x^2 + 3x^2 = 24
   \]
   \[
   6x^2 = 24
   \]
   \[
   x^2 = 4
   \]
   \[
   x = \pm 2
   \]

4. **Finding the corresponding \(y\) values:**
   For \(x = 2\):
   \[
   y = \frac{3}{4} \cdot 2 = 1.5
   \]
   For \(x = -2\):
   \[
   y = \frac{3}{4} \cdot (-2) = -1.5
   \]

5. **Verifying the solutions:**
   We need to check if both \((2, 1.5)\) and \((-2, -1.5)\) satisfy the original equations.
   - For \((2, 1.5)\):
     \[
     \sqrt{2^2 + 1.5^2} + \sqrt{(2-4)^2 + (1.5-3)^2} = \sqrt{4 + 2.25} + \sqrt{4 + 2.25} = \sqrt{6.25} + \sqrt{6.25} = 2.5 + 2.5 = 5
     \]
     \[
     3(2)^2 + 4(2)(1.5) = 12 + 12 = 24
     \]
     Both equations are satisfied.
   - For \((-2, -1.5)\):
     \[
     \sqrt{(-2)^2 + (-1.5)^2} + \sqrt{(-2-4)^2 + (-1.5-3)^2} = \sqrt{4 + 2.25} + \sqrt{36 + 20.25} = \sqrt{6.25} + \sqrt{56.25} = 2.5 + 7.5 = 10 \neq 5
     \]
     The first equation is not satisfied.

Therefore, the only solution is \((2, 1.5)\).

The final answer is \(\boxed{(2, 1.5)}\).