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Question

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

The correct answer is
$4 < x < 5$

Solving First Inequality

We need to solve the first inequality:

$2x - 1 > 7$

  • Add 1 to both sides: $2x - 1 + 1 > 7 + 1$ $2x > 8$
  • Divide both sides by 2: $\frac{2x}{2} > \frac{8}{2}$ $x > 4$

So, the solution for the first inequality is $x > 4$.

Solving Second Inequality

Next, we solve the second inequality:

$2x - 9 < 1$

  • Add 9 to both sides: $2x - 9 + 9 < 1 + 9$ $2x < 10$
  • Divide both sides by 2: $\frac{2x}{2} < \frac{10}{2}$ $x < 5$

The solution for the second inequality is $x < 5$.

Combining Inequality Solutions

We need a value of $x$ that satisfies *both* inequalities simultaneously. This means $x$ must be greater than 4 AND less than 5.

Combining $x > 4$ and $x < 5$ gives the combined inequality:

$4 < x < 5$

Matching Option

Now, compare this result with the given options:

  • Option 1: $x \le -4$
  • Option 2: $-4 < x \le 4$
  • Option 3: $4 < x < 5$
  • Option 4: $x \ge 5$

The expression $4 < x < 5$ exactly matches 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. 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?

  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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