Which expression is equivalent to (4xy+9mn-pq)+(-2xy-9mn+4pq)?

Question

Which expression is equivalent to (4xy+9mn-pq)+(-2xy-9mn+4pq)?

2xy+mn+3pq

6xy+18mn+4pq

2xy+3pq

2xy+18mn-3pq

Answer 1

The expression that is equivalent to (4xy+9mn-pq)+(-2xy-9mn+4pq) is 2xy+18mn-3pq.