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svetlana [45]
3 years ago
6

If 3 * 9 + 2y = 47 what is the value of y

Mathematics
1 answer:
docker41 [41]3 years ago
6 0
Answer: 10

Why?
3*9+2y=47
3*9= 27
27+2y=47
47-27= 20
2y=20
20/2=10
Y=10

Hope this helps :D
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Hello from MrBillDoesMath!

Answer:

The first choice ( -12, 20)



Discussion:

Using matrix multiplication we find the equations:


1x  + 1y = 8                     (A)

2x  + 3y = 36                   (B)


Next, compute

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         (2x + 2y) - (2x + 3y) = 2*8 - 36    =>

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          -y = -20  =>

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Substituting this y value in (A) gives

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Answer:

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We can solve this by "elimination" by multiplying the first equation by -4 and adding the result of the second equation being multiplied by 7.

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