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Which point is not included in the solution set for the inequality?

A. [tex]$(0,6)$[/tex]
B. [tex]$(1,5)$[/tex]
C. [tex]$(2,4)$[/tex]
D. [tex]$(3,2)$[/tex]

Sagot :

Let's solve this problem step-by-step to determine which point is not included in the solution set for the inequality.

Assume we have the inequality [tex]\( y < 2x + 3 \)[/tex].

We will test each point against this inequality:

1. Point [tex]\( (0, 6) \)[/tex]:
- Substitute [tex]\( x = 0 \)[/tex] and [tex]\( y = 6 \)[/tex] into the inequality [tex]\( y < 2x + 3 \)[/tex]:
[tex]\[ 6 < 2(0) + 3 \implies 6 < 3 \][/tex]
- This statement is false because 6 is not less than 3. Therefore, the point [tex]\( (0, 6) \)[/tex] does not satisfy the inequality.

2. Point [tex]\( (1, 5) \)[/tex]:
- Substitute [tex]\( x = 1 \)[/tex] and [tex]\( y = 5 \)[/tex] into the inequality [tex]\( y < 2x + 3 \)[/tex]:
[tex]\[ 5 < 2(1) + 3 \implies 5 < 5 \][/tex]
- This statement is false because 5 is not less than 5. However, [tex]\( 5 = 5 \)[/tex], and we need [tex]\( y \)[/tex] to be strictly less than [tex]\( 2x + 3 \)[/tex]. So, the point [tex]\( (1, 5) \)[/tex] does not satisfy the inequality.

3. Point [tex]\( (2, 4) \)[/tex]:
- Substitute [tex]\( x = 2 \)[/tex] and [tex]\( y = 4 \)[/tex] into the inequality [tex]\( y < 2x + 3 \)[/tex]:
[tex]\[ 4 < 2(2) + 3 \implies 4 < 7 \][/tex]
- This statement is true because 4 is less than 7. Therefore, the point [tex]\( (2, 4) \)[/tex] satisfies the inequality.

4. Point [tex]\( (3, 2) \)[/tex]:
- Substitute [tex]\( x = 3 \)[/tex] and [tex]\( y = 2 \)[/tex] into the inequality [tex]\( y < 2x + 3 \)[/tex]:
[tex]\[ 2 < 2(3) + 3 \implies 2 < 9 \][/tex]
- This statement is true because 2 is less than 9. Therefore, the point [tex]\( (3, 2) \)[/tex] satisfies the inequality.

Based on the above tests, the point that does not satisfy the inequality [tex]\( y < 2x + 3 \)[/tex] is [tex]\( (0, 6) \)[/tex]. Therefore, the point that is not included in the solution set for the inequality is [tex]\( (0, 6) \)[/tex].