Question

5x-8y+2z,3z-4y-2x,6y-z-x and 3x-2z-3y

Answer 1

7x- 9y+3z -2
is the correct answer.
Explanation:

5x-8y+2z +(3z-4y-2) + (6y-z-x) + (3x-2z-3y)
= 5x-8y+2z +3z-4y-2+ 6y-z-x + 3x-2z-3y
=7x- 9y+3z -2

Answer 2

This is a Simultaneous equation that can be used to relate the price of a commodity and quantities of the commodity. Even you such equations are also used to relate the commodity price with the income ratio. You have to multiply the equations by suitable numbers to get the results.  

The correct answer is:  

5x-8y+2z +(3z-4y-2) + (6y-z-x) + (3x-2z-3y)

= 5x-8y+2z +3z-4y-2+ 6y-z-x + 3x-2z-3y

=7x- 9y+3z -2