| | | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 8 | × | 6 | x | + | 8 | × | 7 | y | − | 2 | × | 6 | x | − | 2 | × | 6 | y | = | 36 | x | + | 44 | y | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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(2) | | | | | | | | | | | | | | | | | | | | | | | | 5 | ( | 9 | x | − | 4 | y | − | 6 | ) | + | 9 | ( | 2 | x | − | 4 | y | − | 7 | ) | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 5 | × | 9 | x | − | 5 | × | 4 | y | − | 5 | × | 6 | + | 9 | × | 2 | x | − | 9 | × | 4 | y | − | 9 | × | 7 | = | 63 | x | − | 56 | y | − | 93 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 7 | × | 4 | p | + | 7 | × | 5 | q | + | 9 | × | 4 | p | − | 9 | × | 2 | q | = | 64 | p | + | 17 | q | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | | | | | | | | | | | | | | = | 7 | × | 9 | a | + | 7 | × | 7 | − | 8 | × | 6 | a | − | 8 | × | 10 | = | 15 | a | − | 31 | | | | | | | | | | | | | | | | | | | | | | | | | |
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(5) | | | | | | | | | | | | | | | | | | | | | | | | 9 | ( | 4 | p | + | 2 | q | − | 5 | ) | − | 3 | ( | 6 | p | − | 9 | q | − | 4 | ) | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 9 | × | 4 | p | + | 9 | × | 2 | q | − | 9 | × | 5 | − | 3 | × | 6 | p | + | 3 | × | 9 | q | + | 3 | × | 4 | = | 18 | p | + | 45 | q | − | 33 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | | | | | | | | | | | | | | = | 7 | × | 6 | u | − | 7 | × | 8 | − | 3 | × | 10 | u | − | 3 | × | 5 | = | 12 | u | − | 71 | | | | | | | | | | | | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 6 | × | 6 | u | + | 6 | × | 4 | v | + | 4 | × | 9 | u | − | 4 | × | 2 | v | = | 72 | u | + | 16 | v | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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