-x - 5y - 5z = 2 4x - 5y + 4z = 19 x + 5y - z = -20

Solve by elimination
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1 Answer

(1) -x-5y-5z=2

(2) 4x-5y+4z=19

(3) x+5y-z=-20

(1)+(3): -6z=-18, z=3

(1)→(4): -x-5y-15=2⇒-x-5y=17⇒x+5y=-17

(2)→(5): 4x-5y+12=19⇒4x-5y=7

(4)+(5): 5x=-10, x=-2

From (4): -2+5y=-17, 5y=-15, y=-3.

Solution: x=-2, y=-3, z=3.
by Top Rated User (1.2m points)

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