Start by getting rid of fractions:
42a - 7b + 7c = 61
and
21a - 21b - 14c = 43
yea i did that already and ive gotten so many diffrent answers. and even plugged ihem back in to see if they r right... but no luck... but here is my last work. i found z and y which was z-25/91 and y=160/819 is that right?
basically i tried to ways. one was making 1x+2y-2z=3 into everything equal to 1. and another i did was i just did a regular system of quation.. but yeah. help please.!
(1): x + 2y - 2z = 3
(2):
(3):
(1) x 42 42x + 84y - 84z = 126
(2) x 21 42x - 7y + 7z = 61
(3) x 28 42x - 42y - 28z = 86
(2) - (3) 35y + 35z = -25
7y + yz = -5
7z = -5 - 7y ...(4)
From (1) 42x = 126 - 84y + 84z
(4) into (1) 42x = 126 - 84y + 12(-5 - 7y)
42x = 126 - 60 - 84y - 84y
42x = 66 - 168y ...(5)
(4) and (5) into (2) (66 - 168y) - 7y + (-5 - 7y) = 61
182y = 0
y = 0 ...(6)
(6) into (4) 7z = -5 - 0
...(7)
(6) and (7) into (1)
x =
x =