Question

what should be added to the sum of 21 xy - 3/2 yz + 9/10 z and to - 0.2 xy + 0.8 yz - zx ​ to get 0.5 xy - yz + 0.6 zx​

Answer 1

First, we will add both the numbers.

Secondly, we will subtract the sum we got by adding with the number we want