Question

What should be added to x - y to get 2x?

Answer 1

Answer:

(x+y) should be added

Step-by-step explanation:

Let the number to be added be ''a''

"a" should be added to (x-y) to get 2x

=> a + (x-y) = 2x

=> a + x - y = 2x

=> a = 2x - x + y

=> a = x+y

(x+y) should be added

Answer 2

Answer:

x+y

Step-by-step explanation:

x-y +x+y=

-y+y=0

so x+x=2x