pic puzzle of the day
-a + b - c + d = 0 -2a + b + c - 3d = 0 a + 2b - 3c + d = 0 2a + 3b + 4c - d = 0 a=? b=? c=? d=?
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-a + b - c + d = 0 -2a + b + c - 3d = 0 a + 2b - 3c + d = 0 2a + 3b + 4c - d = 0 a=? b=? c=? d=?
-a + b - c + d = 0 -2a + b + c - 3d = 0 a + 2b - 3c + d = 0 2a + 3b + 4c - d = 0 a=? b=? c=? d=?