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Question

Which one of the following is a representation (not to scale and in bold) of all values of $x$ satisfying the inequality  $2 – 5x \le \frac{6x-5}{3}$on the real numberline?

The correct answer is

Solving the Inequality $2 – 5x \le \frac{6x-5}{3}$

To find the values of $x$ satisfying the inequality, follow these steps:

  1. Start with the given inequality:

    $2 – 5x \le \frac{6x-5}{3}$

  2. Multiply both sides by 3 to clear the fraction. Since 3 is positive, the inequality direction remains unchanged:

    $3(2 – 5x) \le 6x-5$

  3. Distribute the 3 on the left side:

    $6 – 15x \le 6x-5$

  4. Gather the $x$ terms on one side and the constant terms on the other. Add $15x$ to both sides:

    $6 \le 6x + 15x - 5$

    $6 \le 21x - 5$

  5. Add 5 to both sides:

    $6 + 5 \le 21x$

    $11 \le 21x$

  6. Divide both sides by 21. Since 21 is positive, the inequality direction stays the same:

    $\frac{11}{21} \le x$

  7. Rewrite the inequality in the standard form:

    $x \ge \frac{11}{21}$

Number Line Representation

The solution $x \ge \frac{11}{21}$ means $x$ can be any real number greater than or equal to $\frac{11}{21}$.

  • On a number line, this is represented by a closed circle (or a bold dot) at $\frac{11}{21}$, indicating that this value is included in the solution set.
  • The line segment extends to the right from $\frac{11}{21}$ towards positive infinity, showing all values greater than $\frac{11}{21}$ are included.

This representation matches the one shown in Option 3.

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Important Questions from Mathematical Inequalities

  1. A stick of length one meter is broken at two locations at distances of $b_1$ and $b_2$ from the origin (0), as shown in the figure. Note that $0 < b_1 < b_2< 1$. Which one of the following is NOT a necessary condition for forming a triangle using the three pieces?
    Note: All lengths are in meter. The figure shown is representative.

  2. Consider the following inequalities.
    (i) $3p - q < 4$ 
    (ii) $3q - p < 12$ 
    Which one of the following expressions below satisfies the above two inequalities?

  3. Consider the following inequalities. 
    (i) $2x - 1 > 7$ 
    (ii) $2x - 9 < 1$ 
    Which one of the following expressions below satisfies the above two inequalities?

  4. The range of values of x satisfying the inequality $x^2 -3x+2 < 0$ is
  5. The number of solutions for the following system of inequalities is
    $X_1 \ge 0$
    $X_2 \ge 0$
    $X_1+ X_2 \le 10$
    $2X_1+ 2X_2 \ge 22$
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