Question

Find two numbers a and b whose sum a + b is -9 and whose difference a - b is -1.

Answer 1

a has two solutions for this case.

a₁:
`a=-9-b`

a₂:
`a=-1+b`

Explanation:

• A1

`a+b-b=-9-b\\a=-9-b`

• A2

`a-b+b=-1+b\\a=-1+b`

➲ I hope this helps you.