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worty [1.4K]
3 years ago
5

Which of the following groups of numbers are all prime numbers? A. 3, 11, 23, 31 B. 2, 3, 5, 9 C. 2, 5, 15, 19 D. 7, 17, 29, 49

Mathematics
2 answers:
puteri [66]3 years ago
6 0
I think it is A. or D
Mekhanik [1.2K]3 years ago
3 0
A because 9 is not prime in answer B, 15 is not prime in answer C, and 49 is not prime in answer D. So the correct answer is A.
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balu736 [363]

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First isolate one of the variables (x or y) in one of the equations.

Isolate "y" in the first equation(because it is the easiest to isolate) and substitute it into the second equation.

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3x - 3x + y = 3 - 3x

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