Question

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

Answer 1

Answer:

bhzhgzhzhshhdhhhhhxjdjhshdhjzjdjz

Step-by-step explanation:

hbxbzbbbxbzbbbvvccxccxcccccv

Answer 2

Answer:

-20.3xy -0.3yz +0.7zx

Step-by-step explanation:

First of all, let's just add these 2 equations

(21xy-3/2yz+9/10zx) + (-0.2xy+0.8yz-zx)

21xy -3/2 yz + 9/10 zx - 0.2xy + 0.8yz -zx

I'll put the expressions with same variables near each other,

21xy -0.2xy -3/2 yz +0.8yz +9/10 zx -zx

now let's start solving,

21xy -0.2xy -3/2 yz +0.8yz +9/10 zx -zx

20.8xy - (3yz -1.6yz)/2 + (9zx - 10zx)/10

20.8 xy - 1.4yz/2 + (-zx)/10

20.8 xy - 0.7yz - zx/10

or, 20.8 xy - 0.7yz - 0.1zx equation (1)

now then, to get the answer, we'll have to subtract the equation (1), from the final result given to us i.e. "0.5xy-yz+0.6zx"

Therefore,

(0.5xy-yz+0.6zx) - (20.8 xy - 0.7yz - 0.1zx)

0.5xy -yz +0.6zx - 20.8xy + 0.7yz +0.1zx

Again, putting expressions with same variables together,

0.5xy -20.8xy -yz+0.7yz +0.6zx +0.1zx

-20.3xy -0.3yz +0.7zx

This is the required equation to be added to get the result, and thus the correct answer.

You can check it by adding this to the equations.

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