Question

If we add 7xy+5yz-3zx, 4yz+9zx-4y and -3xz+5x-2xy then the answer is
5xy+9yz+3zx+5x-4y
5xy-9yz+3zx-5x-4y
5xy+10yz+3zx+15x-4y
5xy+10yz+3zx+5x-6y​

Answer 1

the answer is the first option

Answer 2

at first, we re-arrenge the numbers

7xy + 5yz - 3zx + 0y + 0x

0xy + 4yz + 9zx - 4y + 0x

-2xy + 0yz - 3zx + 0y + 5x

____________________

5xy + 9yz + 3zx - 4y + 5x

ans is = 5xy + 9yz + 3zx - 4y + 5x