A system of linear equations

has:
1. unique solution, when:

;
2. no solutions, when:

;
3. infinitely many solutions, when:

.
According to the part 3 you can create such system:
Graphs (the same line) are shown on the added picture.
Thanks for putting a graph up!
Your answer is B.
Have a blessed day!
-TheOneandOnly003
Answer:
[8, 44]
Step-by-step explanation:
The average of equally-weighted values is their sum divided by their number.
<h3>Setup</h3>
For some fourth test score x, Paul wants an average between 70 and 79. This gives rise to the inequality ...
70 ≤ (91 +88 +93 +x)/4 ≤ 79
<h3>Solution</h3>
Multiplying by 4, we have ...
280 ≤ 272 +x ≤ 316
8 ≤ x ≤ 44 . . . . . . . . . . subtract 272
Paul will get a C if his fourth test score is in the interval [8, 44].