Answer :
D
because you can’t add or subtract unlike terms for A and B meaning the equations wouldn’t change
for C it would be 10x-15y not -3y
D) x+y+x+y=2x+2y
2(x+y)= 2x+2y
because you can’t add or subtract unlike terms for A and B meaning the equations wouldn’t change
for C it would be 10x-15y not -3y
D) x+y+x+y=2x+2y
2(x+y)= 2x+2y