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

Answer :

To solve the given system of equations, we need to find a common equation that can be derived from the two equations provided:

1. [tex]\( y = 3x^3 - 7x^2 + 5 \)[/tex]

2. [tex]\( y = 7x^4 + 2x \)[/tex]

Since both equations are equal to [tex]\( y \)[/tex], we can set the right-hand sides of these equations equal to each other. This will help us find the equation that can be solved:

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

Thus, the equation that can be solved using this system of equations is:

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

This equation equates the two expressions for [tex]\( y \)[/tex] from the system, and solving it will allow us to find the values of [tex]\( x \)[/tex] that satisfy both original equations.

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