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22 votes
How do u solve these two equations ??

a + 2b = 4
3a + b = 7

2 Answers

10 votes

Answer:

  • a = 2
  • b = 1

Explanation:

We know that:

  • a + 2b = 4
  • 3a + b = 7

Work:

  • a + 2b = 4

3a + b = 7

  • 3(a + 2b = 4)

3a + b = 7

  • 3(a + 2b = 4)
  • 3a + b = 7
  • 3a + 6b = 12
  • 3a + b = 7
  • 3a + 6b = 12
  • -3a - b = -7
  • 5b = 5
  • b = 1

Now, let's substitute the value of b into the first equation.

  • a + 2b = 4
  • => a + 2(1) = 4
  • => a + 2 = 4
  • => a = 2

Hence, the missing values are:

  • a = 2
  • b = 1
User Bill Lin
by
8.0k points
8 votes

Answer:

Explanation:

a + 2b = 4

3a + 6b = 12

3a + b = 7

5b = 5

b = 1

a = 2 because

2(1) + a = 4

User Imran Rasheed
by
7.8k points

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