SOLUTION: Solve.
2x - y - 3z = -1
2x - y + z = -9
x + 2y - 4z = 17
I got so far as;
2x - y - 3z = -1
4z = -8
3y - 5z = 35
Please help.
Algebra.Com
Question 639160: Solve.
2x - y - 3z = -1
2x - y + z = -9
x + 2y - 4z = 17
I got so far as;
2x - y - 3z = -1
4z = -8
3y - 5z = 35
Please help.
Found 2 solutions by Tatiana_Stebko, Alan3354:
Answer by Tatiana_Stebko(1539) (Show Source): You can put this solution on YOUR website!
Multiply the third equation by 2
Subtract the first equation from the second and from the third equations
From the second equation
Substitute into the third equation
Substitute into the first equation
Answer:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Solve.
2x - y - 3z = -1
2x - y + z = -9
x + 2y - 4z = 17
I got so far as;
2x - y - 3z = -1
4z = -8
3y - 5z = 35
Please help.
==================
You have z = -2 from eqn 1 & 2.
4z = -8
z = -2
--------
3y - 5z = 35 **** I don't know about that.
---
2x - y + z = -9
x + 2y - 4z = 17
---
2x - y + z = -9
2x + 4y -8z = 34 times 2
------------------ Subtract
-5y + 9z = -43
Sub for z
-5y - 18 = -43
y = 5
-------
Sub for y & z in any eqn to find x.
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