Smittyyy3 Smittyyy3

08-03-2017
Mathematics

Answered

x + y + z = 7

2x − y + z = 7

3x − z = 2

Verified Answer :

wolf1728 wolf1728

08-03-2017

A) X + y + z = 7

B2x − y + z = 7

C) 3x − z = 2
C) z = 3x -2 Substituting this into equations A) and B)

A) X + y + 3x -2 = 7

B2x − y + 3x -2 = 7 Adding A and B
3x + 6x -4 = 14
9x = 18
x = 2
Since x = 2 then
A) 2 + y + 6 -2 = 7
A) y = 1

A) X + y + z = 7
A) 2 + 1 + z = 7
z = 4

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