ADDITION AND SUBTRACTION

STEPS

EXAMPLES

1. (2ab + 3) + (ab + 1) 

= 2ab  + 3  + ab  + 1

= 2ab + ab + 3 + 1

= 3ab + 4

2. (7x + y) + (8x + 9y)

= 7x + y + 8x + 9y

= 7x + 8x + y + 9y

= 15x + 10y

3. 2ab – 3 - ab - 1

= 2ab - 3 - ab - 1

= 2ab – ab - 3 - 1

= ab – 4

4. 5ab - 19xy - 2ab – 15xy - cd

= 5ab - 19xy - 2ab - 15xy - cd

= 3ab - 34xy - cd