High School

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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 this question, we need to identify which equation from the given options can be derived using the two equations in the provided system of equations:

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

We're looking for an equation that can be solved using this system. Typically, when faced with two equations that both equal [tex]\( y \)[/tex], we can equate them to find a possible solution.

Here’s the step-by-step breakdown:

1. Identify the System of Equations:
- We have the equations:
[tex]\[
y = 3x^3 - 7x^2 + 5
\][/tex]
[tex]\[
y = 7x^4 + 2x
\][/tex]

2. Set the Expressions for [tex]\( y \)[/tex] Equal to Each Other:
- Since both expressions are equal to [tex]\( y \)[/tex], we equate them:
[tex]\[
3x^3 - 7x^2 + 5 = 7x^4 + 2x
\][/tex]

3. Find the Corresponding Option:
- Check which of the given options matches this equation:

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

- The equation [tex]\( 3x^3 - 7x^2 + 5 = 7x^4 + 2x \)[/tex] matches with the second option.

Therefore, the equation that can be solved using the provided system of equations is:

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

This option corresponds to the second choice in the list.

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