(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Solve

2w + 2x - 5y + z = -16 (1)

-w + x + 6y - z = 15 (2)

2w - x + y + 6z = 3 (3)

w + x + 2y - z = 7 (4)

3. The attempt at a solution

(2) + (4) = 2x + 8y - 2z = 22 (5)

2(2) + (3)= x + 13y + 4z = 33(6)

2(2) + (1)= 4x + 7y - z = 14 (7)

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-2(6) + (5)= -18y - 10z = -44 (8)

-4(6) + (7)= -45y - 17z = -118(9)

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-17(8) + 10 (9)= y = 432/90 (10)

then start substituting. is this the best way to do it I found it very tedious and my answers didnt check I obviously made a mistake somewhere but I cant say I know what I did wrong (w,x,y,z) (62/85,207/85,24/5,98/17)

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# System of equations 4 variable

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