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Solve for [tex]$j$[/tex].

[tex] \frac{-4j - 2}{2} \leq 4j + 5 [/tex]

A. [tex] j \geq -\frac{7}{8} [/tex]
B. [tex] j \leq -1 [/tex]
C. [tex] j \geq -\frac{7}{12} [/tex]
D. [tex] j \geq -1 [/tex]

Sagot :

To solve the inequality

[tex]\[ \frac{-4j - 2}{2} \leq 4j + 5, \][/tex]

we will follow these steps:

1. Simplify the left-hand side of the inequality:

[tex]\[ \frac{-4j - 2}{2}. \][/tex]

Divide each term in the numerator by 2:

[tex]\[ \frac{-4j}{2} + \frac{-2}{2} = -2j - 1. \][/tex]

This simplifies the inequality to:

[tex]\[ -2j - 1 \leq 4j + 5. \][/tex]

2. Isolate [tex]\( j \)[/tex] on one side:

To isolate [tex]\( j \)[/tex], we need to get all terms involving [tex]\( j \)[/tex] on one side and constants on the other side. Start by adding [tex]\( 2j \)[/tex] to both sides to get rid of the [tex]\( -2j \)[/tex] term on the left:

[tex]\[ -2j - 1 + 2j \leq 4j + 5 + 2j. \][/tex]

Simplifying this, we get:

[tex]\[ -1 \leq 6j + 5. \][/tex]

3. Move the constant term to the other side:

Subtract 5 from both sides to isolate the [tex]\( j \)[/tex]-term:

[tex]\[ -1 - 5 \leq 6j. \][/tex]

Simplifying this, we get:

[tex]\[ -6 \leq 6j. \][/tex]

4. Solve for [tex]\( j \)[/tex]:

Divide both sides by 6 to isolate [tex]\( j \)[/tex]:

[tex]\[ \frac{-6}{6} \leq j. \][/tex]

Simplifying this, we get:

[tex]\[ -1 \leq j. \][/tex]

This means [tex]\( j \)[/tex] must be greater than or equal to [tex]\(-1\)[/tex].

The solution can be written in interval notation as:

[tex]\[ j \in [-1, \infty). \][/tex]

Thus, the solution to the inequality is

[tex]\[ \boxed{-1 \leq j < \infty}. \][/tex]