System of equations..Using substitution & Elimination

Algebra
Tutor: None Selected Time limit: 1 Day

6x+y+2z=4

3x-3y-3z=-15

x-y=-7

May 4th, 2015

from equation 3; y=7+x

6x+7+x+2Z=4

7X+2Z=-3.......1

3X-21-3X-3Z=-15.

-3Z=6

Z=-2

X=1/7

Y=71/7

May 4th, 2015

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