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josleemarecharl
28.10.2020 •
Mathematics
A science test, which is worth 100 points, consists of 24 questions. Each question is worth either 3 points or 5 points. If x is the number of 3-point questions and y is the number of 5-point questions, the system shown represents this situation.
x + y = 24
3x + 5y = 100
What does the solution of this system indicate about the questions on the test?
The test contains 4 three-point questions and 20 five-point questions.
The test contains 10 three-point questions and 14 five-point questions.
The test contains 14 three-point questions and 10 five-point questions.
The test contains 20 three-point questions and 8 five-point questions.
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Ответ:
3x+3y=72
3x+5y=100
If we subtract two equations,
3x+3y=72
- 3x+5y=100
-2y=-28
y=14
So if we put this on the fir equation,
x+14=24
x=10
So the answer is the second one
Ответ:
Step-by-step explanation: