Which two of the equations shown below are equivalent? Explain your reasoning.

[tex]
2x + 7 = 1 \quad -3x + 4 = 12 \quad x = -3
[/tex]

A. The equations [tex]2x + 7 = 1[/tex] and [tex]x = -3[/tex] are equivalent because both have the same solution, [tex]-\frac{7}{2}[/tex].

B. The equations [tex]2x + 7 = 1[/tex] and [tex]-3x + 4 = 12[/tex] are equivalent because both have the same solution, [tex]-\frac{8}{3}[/tex].

C. The equations [tex]2x + 7 = 1[/tex] and [tex]x = -3[/tex] are equivalent because both have the same solution, [tex]-3[/tex].

D. The equations [tex]-3x + 4 = 12[/tex] and [tex]x = -3[/tex] are equivalent because both have the same solution, [tex]-3[/tex].



Answer :

Let's analyze whether any of the equations are equivalent by solving them step-by-step to check for their solutions.

1. Equation 1: [tex]\( 2x + 7 = 1 \)[/tex]

Simplifying this equation, we get:
[tex]\[ 2x + 7 = 1 \][/tex]
Subtracting 7 from both sides:
[tex]\[ 2x = 1 - 7 \][/tex]
[tex]\[ 2x = -6 \][/tex]
Dividing both sides by 2:
[tex]\[ x = -3 \][/tex]

2. Equation 2: [tex]\( -3x + 4 = 12 \)[/tex]

Simplifying this equation, we get:
[tex]\[ -3x + 4 = 12 \][/tex]
Subtracting 4 from both sides:
[tex]\[ -3x = 12 - 4 \][/tex]
[tex]\[ -3x = 8 \][/tex]
Dividing both sides by -3:
[tex]\[ x = \frac{8}{-3} \][/tex]
[tex]\[ x = -\frac{8}{3} \][/tex]

3. Equation 3: [tex]\( x = -3 \)[/tex]

This equation is already simplified:
[tex]\[ x = -3 \][/tex]

Now we compare the solutions:

- Equation [tex]\( 2x + 7 = 1 \)[/tex] has the solution [tex]\( x = -3 \)[/tex].
- Equation [tex]\( -3x + 4 = 12 \)[/tex] has the solution [tex]\( x = -\frac{8}{3} \)[/tex].
- Equation [tex]\( x = -3 \)[/tex] is already in the form [tex]\( x = -3 \)[/tex].

From the above analysis, we see that the solutions for the equations [tex]\( 2x + 7 = 1 \)[/tex] and [tex]\( x = -3 \)[/tex] are both [tex]\( x = -3 \)[/tex]. Therefore, these two equations are equivalent.

The correct statement should be:
"The equations [tex]\( 2x + 7 = 1 \)[/tex] and [tex]\( x = -3 \)[/tex] are equivalent because both have the same solution, -3."

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