Respuesta :

Need to Find:

  • Value of (x -y)?

Solution:

15x + 17y = 31

17x + 15y = 21

- - -

───────

-2x + 2y = 10

→ -2 (x -y) = 10

→ x - y = -5

Value of (x - y) is -5

lhmarianateixeira

In this exercise we have to use the knowledge of equation to find the value, so:

[tex]x-y=-5[/tex]

What is the system solution?

The solution of a linear system is every ordered and finite set that satisfies all the equations of the system at the same time. The number of elements in the solution set is always equal to the number of unknowns in the system.

So we have:

[tex]15x + 17y = 31\\17x + 15y = 21\\-2x + 2y = 10\\-2 (x -y) = 10\\x - y = -5[/tex]

See more about system at brainly.com/question/9061107

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