Question

Solve this linear equation
a+b=8
a-b=4

Answer 1

a = 6 , b = 2

Explanation:

a+b - (a-b) = 2b

8 - 4 = 4

2b = 4

b = 4 ÷ 2

b = 2

When b = 2,

a+2 = 8

a = 8 - 2

a = 6

Answer 2

a = 12 b = -4

Explanation:

To solve this equation it would be easiest to use the elimination method

a + b = 8

a - b = 4

a = 12

Now all we have to do is substitute 12 for a in any equation. For this I will use the first one.

12 + b = 8

Lastly subtract 12 from both sides

b = -4