How will the solution of the system [tex]y \ \textgreater \ 2x + \frac{2}{3}[/tex] and [tex]y \ \textless \ 2x + \frac{1}{3}[/tex] change if the inequality sign on both inequalities is reversed to [tex]y \ \textless \ 2x + \frac{2}{3}[/tex] and [tex]y \ \textgreater \ 2x + \frac{1}{3}[/tex]?



Answer :

To address how the solution changes when the inequalities are reversed, let's examine the initial and the modified systems of inequalities step-by-step.

### Initial System of Inequalities

The initial system of inequalities is:
1. [tex]\( y > 2x + \frac{2}{3} \)[/tex]
2. [tex]\( y < 2x + \frac{1}{3} \)[/tex]

#### Interpret the Initial System

- The first inequality, [tex]\( y > 2x + \frac{2}{3} \)[/tex], represents the region above the line [tex]\( y = 2x + \frac{2}{3} \)[/tex].
- The second inequality, [tex]\( y < 2x + \frac{1}{3} \)[/tex], represents the region below the line [tex]\( y = 2x + \frac{1}{3} \)[/tex].

Since [tex]\( y = 2x + \frac{2}{3} \)[/tex] and [tex]\( y = 2x + \frac{1}{3} \)[/tex] are parallel lines (both have the same slope of 2), the solution to the initial system is the region that lies above the line [tex]\( y = 2x + \frac{2}{3} \)[/tex] and below the line [tex]\( y = 2x + \frac{1}{3} \)[/tex].

### Modified System of Inequalities

When we reverse the inequality signs, the system becomes:
1. [tex]\( y < 2x + \frac{2}{3} \)[/tex]
2. [tex]\( y > 2x + \frac{1}{3} \)[/tex]

#### Interpret the Modified System

- The first inequality, [tex]\( y < 2x + \frac{2}{3} \)[/tex], now represents the region below the line [tex]\( y = 2x + \frac{2}{3} \)[/tex].
- The second inequality, [tex]\( y > 2x + \frac{1}{3} \)[/tex], now represents the region above the line [tex]\( y = 2x + \frac{1}{3} \)[/tex].

Thus, the solution to the modified system is the region that lies below the line [tex]\( y = 2x + \frac{2}{3} \)[/tex] and above the line [tex]\( y = 2x + \frac{1}{3} \)[/tex].

### Conclusion

By reversing the inequality signs in the original system, the solution becomes the area between the parallel lines [tex]\( y = 2x + \frac{2}{3} \)[/tex] and [tex]\( y = 2x + \frac{1}{3} \)[/tex]. Therefore, the solution to the modified system is:

[tex]\[ \boxed{\text{The solution is the area between the parallel lines } y = 2x + \frac{1}{3} \text{ and } y = 2x + \frac{2}{3}.} \][/tex]