SOLUTION: Obtain an equivalent system by performing the stated elementary operation on the system. Replace the first equation by the sum of itself and 3 times the second equation. -7x -1

Question 1117714: Obtain an equivalent system by performing the stated elementary operation on the system. Replace the first equation by the sum of itself and 3 times the second
equation.
-7x -10y -14z= -35
6x -9y +3z= -24
5x +7y +8z= -20
Found 2 solutions by josgarithmetic, solver91311:
Answer by josgarithmetic(39630) (Show Source): You can put this solution on YOUR website!
What to do was clearly stated for you, so that is what you need to do!

"Replace the first equation by the sum of itself and 3 times the second
equation. "
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!

-7x -10y -14z = -35 6x - 9y + 3z = -24 5x + 7y + 8z = -20 3R2 = 18x -27y + 9z = - 72 R1 = - 7x -10y -14z = - 35 ------------------------ 3R2 + R1 = 11x -37y - 5z = -107 11x -37y - 5z = -107 6x - 9y + 3z = -24 5x + 7y + 8z = -20

John

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

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