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kenny6666 [7]
2 years ago
12

Solve the following systems of equations 2a+4b+c=5 ; a-4b=-6 ; 2b+c=7.

Mathematics
1 answer:
SOVA2 [1]2 years ago
8 0

Answer:

a = -2

b = 1

c = 5

Step-by-step explanation:

Given:

2a + 4b + c = 5 ............(1)

a - 4b = - 6

or

a = 4b - 6 .............(2)

2b + c = 7

or

c = 7 - 2b   ...........(3)

substituting 2 and 3 in  1, we get

2(4b - 6 ) + 4b + (7 - 2b) = 5

or

8b - 12 + 4b + 7 - 2b = 5

or

10b - 5 = 5

or

b = 1

substituting b in 2, we get

a = 4(1) - 6

or

a = -2

substituting b in 3, we get

c = 7 - 2(1)

or

c = 5

thus,

a = -2

b = 1

c = 5

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Full question:

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We start from known to unknown. We know that Mai scored 5 points and so we work from here.

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Answer:

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Step-by-step explanation:

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Answer:

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