Which of the following is an equivalent form of the compound inequality [tex]-33 \ \textgreater \ -3x - 6 \geq -36[/tex]?

A. [tex]-3x - 6 \ \textgreater \ -33[/tex] and [tex]-3x - 6 \geq -36[/tex]
B. [tex]-3x - 6 \ \textless \ -33[/tex] and [tex]-3x - 6 \geq -36[/tex]
C. [tex]-3x \ \textgreater \ -33[/tex] and [tex]-6 \geq -36[/tex]
D. [tex]-3x - 6 \ \textless \ -33[/tex] and [tex]-3x - 6 \leq -36[/tex]



Answer :

To solve the compound inequality [tex]\(-33 > -3x - 6 \geq -36\)[/tex], it is convenient to first break it down into two separate inequalities and then solve each one.

The compound inequality can be separated as:
1. [tex]\(-33 > -3x - 6\)[/tex]
2. [tex]\(-3x - 6 \geq -36\)[/tex]

#### Step-by-Step Solution for Each Inequality:

1. Solving [tex]\(-33 > -3x - 6\)[/tex]:
[tex]\[ -33 > -3x - 6 \][/tex]
Add [tex]\(6\)[/tex] to both sides:
[tex]\[ -33 + 6 > -3x \][/tex]
[tex]\[ -27 > -3x \][/tex]
Divide both sides by [tex]\(-3\)[/tex], remembering to reverse the inequality sign:
[tex]\[ \frac{-27}{-3} < x \][/tex]
[tex]\[ 9 < x \quad \text{or} \quad x > 9 \][/tex]

2. Solving [tex]\(-3x - 6 \geq -36\)[/tex]:
[tex]\[ -3x - 6 \geq -36 \][/tex]
Add [tex]\(6\)[/tex] to both sides:
[tex]\[ -3x - 6 + 6 \geq -36 + 6 \][/tex]
[tex]\[ -3x \geq -30 \][/tex]
Divide both sides by [tex]\(-3\)[/tex], remembering to reverse the inequality sign:
[tex]\[ \frac{-30}{-3} \leq x \][/tex]
[tex]\[ 10 \leq x \quad \text{or} \quad x \geq 10 \][/tex]

#### Combining the Two Results:
From solving both inequalities, we have:
1. [tex]\(x > 9\)[/tex]
2. [tex]\(x \geq 10\)[/tex]

The solution we get must satisfy both of these conditions simultaneously. The overlap of these two intervals is [tex]\(x \geq 10\)[/tex].

However, the question was to find an equivalent form of the compound inequality. The equivalent compound inequalities, before solving further, are:
1. [tex]\(-3x - 6 > -33\)[/tex]
2. [tex]\(-3x - 6 \geq -36\)[/tex]

Thus, among the given choices:

- [tex]\(-3x - 6 > -33\)[/tex] and [tex]\(-3x - 6 \geq -36\)[/tex]
- [tex]\(-3x - 6 < -33\)[/tex] and [tex]\(-3x - 6 \geq -36\)[/tex]
- [tex]\(-3x > -33\)[/tex] and [tex]\(-6 \geq -36\)[/tex]
- [tex]\(-3x - 6 < -33\)[/tex] and [tex]\(-3x - 6 \leq -36\)[/tex]

The correct equivalent form of the compound inequality [tex]\(-33 > -3x - 6 \geq -36\)[/tex] is:
[tex]\[ -3x - 6 > -33 \quad \text{and} \quad -3x - 6 \geq -36 \][/tex]

Thus, the answer is:

[tex]\[ -3x - 6 > -33 \quad \text{and} \quad -3x - 6 \geq -36 \][/tex]

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