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------------------------------------------------ Which equation can be solved by using this system of equations?

[tex]
\[
\begin{cases}
y = 3x^3 - 7x^2 + 5 \\
y = 7x^4 + 2x
\end{cases}
\]
[/tex]

A. [tex]3x^3 - 7x^2 + 5 = 0[/tex]

B. [tex]3x^3 - 7x^2 + 5 = 7x^4 + 2x[/tex]

C. [tex]7x^4 + 2x = 0[/tex]

D. [tex]7x^4 + 3x^3 - \sqrt{3}x^2 + 2x + 5 = 0[/tex]

Answer :

To determine which equation can be solved using the given system of equations, let's carefully analyze and compare the system:

1. The system provided is:
- Equation 1: [tex]\( y = 3x^3 - 7x^2 + 5 \)[/tex]
- Equation 2: [tex]\( y = 7x^4 + 2x \)[/tex]

2. We want to find out which of the given options can be derived from this system of equations. The choices are:
- [tex]\( 3x^3 - 7x^2 + 5 = 0 \)[/tex]
- [tex]\( 3x^3 - 7x^2 + 5 = 7x^4 + 2x \)[/tex]
- [tex]\( 7x^4 + 2x = 0 \)[/tex]
- [tex]\( 7x^4 + 3x^3 - \sqrt{3}x^2 + 2x + 5 = 0 \)[/tex]

3. Since both equations in the system are equal to [tex]\( y \)[/tex], we can equate them to find a common equation:
- Solution: Set the two expressions for [tex]\( y \)[/tex] equal to each other.
- This means [tex]\( 3x^3 - 7x^2 + 5 = 7x^4 + 2x \)[/tex].

4. By equating:
- [tex]\( 3x^3 - 7x^2 + 5 = 7x^4 + 2x \)[/tex]

5. This matches the second option from the choices given.

Thus, the equation that can be solved using this system of equations is:
[tex]\[ 3x^3 - 7x^2 + 5 = 7x^4 + 2x \][/tex]