SOLUTION: Which answer correctly shows the first step that can be used to correctly solve the system of equations? 5x + 2y = 4 3x + 4y + 2z = 6 7x + 3y + 4z = 29 A. 3x + 4y + 2z

Algebra ->  Linear-equations -> SOLUTION: Which answer correctly shows the first step that can be used to correctly solve the system of equations? 5x + 2y = 4 3x + 4y + 2z = 6 7x + 3y + 4z = 29 A. 3x + 4y + 2z       Log On


   

Question 1023398: Which answer correctly shows the first step that can be used to correctly solve the system of equations?
5x + 2y = 4
3x + 4y + 2z = 6
7x + 3y + 4z = 29
A.
3x + 4y + 2z = 6 → 3x + 4y + 4z = 6
7x + 3y + 4z = 29 → (­-)7x + 3y + 4z = 29
-4x ­- y =- ­23
B.
3x + 4y + 2z = 6 → 6x + 8y + 4z = 12
7x + 3y + 4z = 29 → (-­)7x + 3y + 4z = 29
-x + 5y = ­-17
C.
3x + 4y + 2z = 6 → 6x + 8y + 4z = 6
7x + 3y + 4z = 29 → (-­)7x + 3y + 4z = 2
-x + 5y =- ­23
D.
3x + 4y + 2z = 6 → 6x + 8y + 4z = 12
7x + 3y + 4z = 29 → (-­)7x + 3y + 4z = 29
-x + 8y = 41
Answer by solver91311(24713) About Me  (Show Source):
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None of them are correct. If you multiply the first term of one of the equations by -1, then you have to multiply ALL of the terms by -1. So in every case is not correct.

John

My calculator said it, I believe it, that settles it