Hi, the third equation must be y = 2x
Multiply the first equation by 25:
1000 = 25x + 25y + 25z
Use the second equation subtract the previous one,
670 = 10y + 25z
Substitute y = 2x into the first equation
40 = 3x +z
z = 40 - 3x
670 = 10y + 1000 - 75x
670 = 20x + 1000 - 75x
-330 = -55x
x = 6
z = 40-3(6)=22
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