Question

Difficulty: MediumLinear Inequalities in One Variable

For the inequality 2(3x4)+5>3x12-2(3x - 4) + 5 > -3x - 12, which inequality represents all possible values of xx?

  1. A
    x>253x > \frac{25}{3}
  2. B
    x<259x < \frac{25}{9}
  3. C
    x<3x < 3
  4. x<253x < \frac{25}{3}Answer

Answer

x<253x < \frac{25}{3}
The correct inequality is obtained by first distributing 2-2 to the terms inside the parentheses to get 6x+8+5>3x12-6x + 8 + 5 > -3x - 12. Combining the constants on the left yields 6x+13>3x12-6x + 13 > -3x - 12. Adding 3x3x to both sides results in 3x+13>12-3x + 13 > -12, and subtracting 13 from both sides gives 3x>25-3x > -25. Finally, dividing by 3-3 and flipping the inequality sign results in the correct solution.

Step-by-Step Solution

1
Distribute 2-2 to the terms inside the parentheses on the left side of the inequality.
6x+8+5>3x12-6x + 8 + 5 > -3x - 12
Applying the distributive property simplifies the expression.
2
Combine the constant terms on the left side.
6x+13>3x12-6x + 13 > -3x - 12
Simplifying the constant terms makes it easier to isolate the variable.
3
Add 3x3x to both sides to move all variable terms to the left side.
3x+13>12-3x + 13 > -12
This isolates the variable terms on one side of the inequality.
4
Subtract 13 from both sides to isolate the variable term.
3x>25-3x > -25
This isolates the term containing xx.
5
Divide both sides by 3-3 and reverse the direction of the inequality sign.
x<253x < \frac{25}{3}
Dividing by a negative number requires reversing the inequality sign.

Key Concept

Solving linear inequalities in one variable using the distributive property and sign reversal rules.
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