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Solve the compound inequality.

[tex]\[ -8 \leq \frac{-3x + 1}{4} \leq 2 \][/tex]


Sagot :

Let's solve the compound inequality step-by-step.

The given inequality is:
[tex]\[ -8 \leq \frac{-3x + 1}{4} \leq 2 \][/tex]

This is a compound inequality composed of two simpler inequalities:
1. [tex]\(-8 \leq \frac{-3x + 1}{4}\)[/tex]
2. [tex]\(\frac{-3x + 1}{4} \leq 2\)[/tex]

We will solve each part separately and then find the intersection of the solutions.

### Solving [tex]\(-8 \leq \frac{-3x + 1}{4}\)[/tex]

Step 1: Eliminate the fraction by multiplying all terms by 4.
[tex]\[ 4 \cdot (-8) \leq -3x + 1 \cdot 4 \][/tex]
[tex]\[ -32 \leq -3x + 1 \][/tex]

Step 2: Isolate the term with [tex]\(x\)[/tex] by subtracting 1 from both sides.
[tex]\[ -32 - 1 \leq -3x \][/tex]
[tex]\[ -33 \leq -3x \][/tex]

Step 3: Solve for [tex]\(x\)[/tex] by dividing both sides by [tex]\(-3\)[/tex]. Remember, when you divide by a negative number, the inequality sign reverses.
[tex]\[ \frac{-33}{-3} \geq x \][/tex]
[tex]\[ 11 \geq x \][/tex]
or
[tex]\[ x \leq 11 \][/tex]

### Solving [tex]\(\frac{-3x + 1}{4} \leq 2\)[/tex]

Step 1: Eliminate the fraction by multiplying all terms by 4.
[tex]\[ \frac{-3x + 1}{4} \cdot 4 \leq 2 \cdot 4 \][/tex]
[tex]\[ -3x + 1 \leq 8 \][/tex]

Step 2: Isolate the term with [tex]\(x\)[/tex] by subtracting 1 from both sides.
[tex]\[ -3x + 1 - 1 \leq 8 - 1 \][/tex]
[tex]\[ -3x \leq 7 \][/tex]

Step 3: Solve for [tex]\(x\)[/tex] by dividing both sides by [tex]\(-3\)[/tex]. Remember, when you divide by a negative number, the inequality sign reverses.
[tex]\[ \frac{7}{-3} \geq x \][/tex]
[tex]\[ -\frac{7}{3} \geq x \][/tex]
or
[tex]\[ x \leq -\frac{7}{3} \][/tex]

### Combining the solutions

We have two conditions:
1. [tex]\(x \leq 11\)[/tex]
2. [tex]\(x \leq -\frac{7}{3}\)[/tex]

The solution to the compound inequality will be the intersection of these two solutions. The intersection of [tex]\(x \leq 11\)[/tex] and [tex]\(x \leq -\frac{7}{3}\)[/tex] is:

[tex]\[ x \leq -\frac{7}{3} \][/tex]

Therefore, the solution to the compound inequality is:
[tex]\[ x \leq -\frac{7}{3} \][/tex]