how to do 4(x + 2y) - ( x + y

Question

how to do this problem.

Answer 1

First you need to distribute the 4 and negative sign

4(x+2y)-(x+y)=4x+8y-x-y

Then you need to combine like terms. 

4x-x+8y-y

=3x+7y 

Answer 2

4(x+2y) - (x+y)

 

Distribute the 4 and the minus sign:

 

4*x + 4*2y - x - y

 

4x + 8y - x - y

 

Combine like-terms:

 

4x - x + 8y - y

 

3x + 7y