College

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 question, we need to determine which equation can be derived from the given system of equations.

The system of equations provided is:

1. [tex]\( y = 3x^3 - 7x^2 + 5 \)[/tex]
2. [tex]\( y = 7x^4 + 2x \)[/tex]

To find which equation can be solved using these equations, we can set the two expressions for [tex]\( y \)[/tex] equal to each other, because they both represent [tex]\( y \)[/tex]. This results in a single equation:

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

Next, let's compare the possible answer choices:

1. [tex]\( 3x^3 - 7x^2 + 5 = 0 \)[/tex]
2. [tex]\( 3x^3 - 7x^2 + 5 = 7x^4 + 2x \)[/tex]
3. [tex]\( 7x^4 + 2x = 0 \)[/tex]
4. [tex]\( 7x^4 + 3x^3 - 7x^2 + 2x + 5 = 0 \)[/tex]

The equation we derived from the system, [tex]\( 3x^3 - 7x^2 + 5 = 7x^4 + 2x \)[/tex], matches the second option exactly. Therefore, the correct answer is:

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

So, this is the equation that can be solved using the given system of equations.