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OpenStudy (anonymous):
Solve using the substitution method . A math test is worth 100 points . Each problem is either 3 or 4 points. How many 4 point problems are there ?
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OpenStudy (anonymous):
3x + 4y = 100
OpenStudy (anonymous):
Insufficient data to form a unique solution.
OpenStudy (matt101):
ktklown is correct. How many questions are on the test? Does it say anywhere a relationship between the number of each kind of question (e.g. there are 3 more 3-point questions than 4-point questions)?
OpenStudy (anonymous):
I am so sorry , I forgot to put that there are 30 problems.
OpenStudy (anonymous):
3x + 4(30-x) = 100 3x + 120 - 4x = 100 x = 20 y = 10 10 4-points problem
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OpenStudy (anonymous):
Thankyou (:
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