The sum of the given expressions would be: 7xy+5yz-3zx;4yz+9zx-4y and -3xy
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Answer:
7xy-3xy+5yz+4yz-3zx+9zx-4y
4xy+9yz+6zx-4y
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Step-by-step explanation:
(7xy+5yz-3zx) + (4yz+9zx-4y) + (-3xy)
= 7xy - 3xy + 5yz + 4yz - 3zx + 9zx - 4y
= 4xy + 9yz + 6zx - 4y
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