SOLUTION: I need to solve this equation in three variables 2x

SOLUTION: I need to solve this equation in three variables 2x - y =2 3z = 21 4x + z =19

Question 60730This question is from textbook
: I need to solve this equation in three variables 2x - y =2 3z = 21 4x + z =19 This question is from textbook

Answer by uma(370) (Show Source): You can put this solution on YOUR website!
Given that
2x - y =2  (1)
3z = 21 (2)
4x + z =19 (3)
First solve the second equation, since it has only one variable.
3z =21
Divide by 3
z = 21/3
z =7
Now put the value of z in equation (3), we get
4x + 7 = 19
4x = 19 -7
4x =12
x =12/4
x = 3
Now put the value of x in equation(1), we get
2(3)- y =2
6 � y = 2
6 � 2 = y
4 = y
Therefore the value of �x� =3, y =4 and z =7

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