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Determine if the following equations have one solution, no solutions, or infinitely many solutions and explain your reasoning.

a. [tex]5x - 2 = 5x + 9[/tex]
- No solution

b. [tex]6x + 8 = 8 + 6x[/tex]
- Infinitely many solutions

c. [tex]3x + 4 = 2x + 8[/tex]
- One solution


Sagot :

Certainly! Let's analyze each of the given equations to determine if they have one solution, no solutions, or infinitely many solutions.

### Equation [tex]\(a\)[/tex]: [tex]\(5x - 2 = 5x + 9\)[/tex]

1. Simplify both sides:
[tex]\[ 5x - 2 = 5x + 9 \][/tex]

2. Subtract [tex]\(5x\)[/tex] from both sides:
[tex]\[ 5x - 5x - 2 = 5x - 5x + 9 \implies -2 = 9 \][/tex]

3. The resulting statement [tex]\(-2 = 9\)[/tex] is a contradiction because it is not true.

Thus, Equation [tex]\(a\)[/tex] has no solution since there is no value of [tex]\(x\)[/tex] that can satisfy this equation.

### Equation [tex]\(b\)[/tex]: [tex]\(6x + 8 = 8 + 6x\)[/tex]

1. Simplify both sides:
[tex]\[ 6x + 8 = 8 + 6x \][/tex]

2. Subtract [tex]\(6x\)[/tex] from both sides:
[tex]\[ 6x - 6x + 8 = 8 + 6x - 6x \implies 8 = 8 \][/tex]

3. The resulting statement [tex]\(8 = 8\)[/tex] is always true, which means the original equation does not depend on [tex]\(x\)[/tex].

Thus, Equation [tex]\(b\)[/tex] has infinitely many solutions since any value of [tex]\(x\)[/tex] will satisfy this equation.

### Equation [tex]\(c\)[/tex]: [tex]\(3x + 4 = 2x + 8\)[/tex]

1. Simplify both sides:
[tex]\[ 3x + 4 = 2x + 8 \][/tex]

2. Subtract [tex]\(2x\)[/tex] from both sides:
[tex]\[ 3x - 2x + 4 = 2x - 2x + 8 \implies x + 4 = 8 \][/tex]

3. Subtract 4 from both sides:
[tex]\[ x + 4 - 4 = 8 - 4 \implies x = 4 \][/tex]

Thus, Equation [tex]\(c\)[/tex] has one solution, which is [tex]\(x = 4\)[/tex].

### Summary

- Equation [tex]\(a\)[/tex]: No solution
- Equation [tex]\(b\)[/tex]: Infinitely many solutions
- Equation [tex]\(c\)[/tex]: One solution (specifically [tex]\(x = 4\)[/tex])