Question

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

2a + b = 8
2a - 2b - 12
a - 2b = 11
2(a - b) = 6

Answer 1

2a plus 6 equl eight i hink so

Answer 2

Solve the given system first

• 5 + b = 3
• a - b = 7

Find b:

• b = 3 - 5 = -2

Find a:

• a - (-2) = 7
• a = 7 - 1
• a = 5

Verify the options for correctness:

• 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