x = 23 si y + z = 41
a) 3 x + 2 y + 2 z = 151
= 3 × 23 + 2 × ( y + z ) = 69 + 2 × 41 = 69 + 82 = 151
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b) 5 x + 3 y + 3 z = 238
= 5 × 23 + 3 × ( y + z ) = 115 + 3 × 41 = 115 + 123 = 238
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c) 8 x + 5 y + 5 z = 389
8 × 23 + 5 × ( y + z ) = 184 + 5 × 41 = 184 + 205 = 389
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d) 4 y + 4 z - 5 x = 49
= 4 × ( y + z ) - 5 × 23 = 4 × 41 - 115 = 164 - 115 = 49
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e) 7 z + 7 y - 9 x = 80
= 7 × ( y + z ) - 9 × 23 = 7 × 41 - 207 = 287 - 207 = 80
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f) 9 y + 9 z + 7 x = 530
= 9 × ( y + z ) + 7 × 23 = 9 × 41 + 161 = 369 + 161 = 530
