SOLUTION: x-3y = 12
2y -3z = -9
2x +z = 7
solve for all three variables
Algebra.Com
Question 670813: x-3y = 12
2y -3z = -9
2x +z = 7
solve for all three variables
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Hint:
Solve for z in 2x +z = 7 to get z = -2x+7
Then plug this into the second equation to get
2y -3z = -9
2y -3(-2x+7) = -9
2y + 6x - 21 = -9
2y + 6x = -9 + 21
2y + 6x = 12
6x + 2y = 12
-------------------------------------------------------
You now have the system
x-3y = 12
6x + 2y = 12
Use any method to solve this to find x and y. Then use x to find z.
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