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marin [14]
3 years ago
9

If 5 + b = 3 and a - b = 7 , then which of the following is true?

Mathematics
2 answers:
brilliants [131]3 years ago
4 0

2a plus 6 equl eight i hink so

ira [324]3 years ago
4 0

Answer:

<u>Solve the given system first</u>

  • 5 + b = 3
  • a - b = 7

<u>Find b:</u>

  • b = 3 - 5 = -2

<u>Find a:</u>

  • a - (-2) = 7
  • a = 7 - 1
  • a = 5

<u>Verify the options for correctness:</u>

  • 2a + b = 2(5) + (-2) = 10 - 2 = 8, correct
  • 2a - 2b = 2(5) - 2(-2) = 10 + 4 = 14, incorrect
  • a - 2b = 5 - 2(-2) = 5 + 4 = 9, incorrect
  • 2(a - b) = 2(5 - (-2)) = 2(7) = 14, incorrect

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If in the linear equation, one variable is present, then the equation is known as the linear equation in one variable.

We have two equations:

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