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Solve and graph the following inequality: [tex]2x + 5 \ \textgreater \ -9[/tex]


Sagot :

Let's solve the inequality [tex]\(2x + 5 > -9\)[/tex] step-by-step and then graph it.

### Step-by-Step Solution

1. Isolate the variable `x`:

To solve for [tex]\(x\)[/tex], we need to isolate it on one side of the inequality. Start by subtracting 5 from both sides:
[tex]\[ 2x + 5 - 5 > -9 - 5 \][/tex]
Simplifying this, we get:
[tex]\[ 2x > -14 \][/tex]

2. Solve for `x`:

Next, divide both sides by 2 to solve for [tex]\(x\)[/tex]:
[tex]\[ \frac{2x}{2} > \frac{-14}{2} \][/tex]
Simplifying this, we obtain:
[tex]\[ x > -7 \][/tex]

### Graphing the Solution

Now that we have the solution [tex]\(x > -7\)[/tex], we will graph this inequality.

#### Graphing Steps

1. Draw the coordinate plane:
- Label the x-axis (horizontal) and the y-axis (vertical).

2. Plot the boundary:
- Mark the line [tex]\(x = -7\)[/tex] on the x-axis. This line is the boundary for our inequality.

3. Shade the region:
- Since the inequality is [tex]\(x > -7\)[/tex], we will shade the region to the right of the line [tex]\(x = -7\)[/tex]. This indicates all [tex]\(x\)[/tex] values greater than [tex]\(-7\)[/tex].

4. Style the boundary line:
- Because the inequality is strictly greater than ([tex]\(>\)[/tex]), we use a dashed line to indicate that points on the line [tex]\(x = -7\)[/tex] are not included in the solution.

#### Graph Description
- The x-axis should be labeled with appropriate values, including -7.
- A dashed vertical line should be drawn at [tex]\(x = -7\)[/tex] to indicate the boundary.
- The region to the right of this line should be shaded to represent [tex]\(x > -7\)[/tex].

Here's a sketch of what the graph would look like:

```markdown
y
|
|
|
|
|
-------------|-----------------------
-7 x
(Region to the right of x = -7 is shaded)
```

### Conclusion

The solution to the inequality [tex]\(2x + 5 > -9\)[/tex] is [tex]\(x > -7\)[/tex]. The corresponding graph includes a dashed vertical line at [tex]\(x = -7\)[/tex] with the region to the right of this line shaded to indicate all [tex]\(x\)[/tex] values greater than [tex]\(-7\)[/tex].