Engineering Mechanics - General Principles - Discussion
Discussion Forum : General Principles - General Questions (Q.No. 4)
4.
Solve the following equation for x, y, and z:
x – y + z = –1 –x + y + z = –1 x + 2y – 2z = 5
Discussion:
14 comments Page 2 of 2.
Mohit said:
9 years ago
@Karthik. Your method is wrong for solving the problem because if you putting the values of option D then you also get equal equations.
@zikky90 said:
9 years ago
Using elimination method.
Step 1: Sum up eq (1) , (2) and (3). Leaves you with x+2y=3, therefore, x=3-2y.
Step 2: Put in value of x in step 1 into eq (3) , therefore z=-1.
Step 3: Put value of x in step 1 and z in step 2 into eq (2) , therefore y=1.
Step 4: Put in value of why into step 1, therefore x = 1.
Answer: x=1, y=1, z=-1.
Step 1: Sum up eq (1) , (2) and (3). Leaves you with x+2y=3, therefore, x=3-2y.
Step 2: Put in value of x in step 1 into eq (3) , therefore z=-1.
Step 3: Put value of x in step 1 and z in step 2 into eq (2) , therefore y=1.
Step 4: Put in value of why into step 1, therefore x = 1.
Answer: x=1, y=1, z=-1.
Venkatesh said:
8 years ago
Solve by Cramer's rule (matrix method).
Manohar h s said:
6 years ago
I didn't understand this. Please, anyone, explain me.
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