Add: 7xy + 5yz – 3zx, 4yz + 9zx – 4y and –3xz + 5x – 2xy.
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3
Adding all three will result in = 5xy + 9yz - 6zx + 5x - 4y
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1
Step-by-step explanation:
7xy+5yz-3zx+4yz+9zx-4y-3xz+5x-2xy
then rearrange:
7xy-2xy+5yz+4yz-3zx-3zx+9zx-4y+5x
=5xy+9yz+3zx-4y+5x
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