a) x+y = 27
x | 1 | 3 | 7 | 11 | 15 | 20 | 24
y | 26 | 24 | 20 | 16 | 12 | 7 | 3
b) 3x+y = 7
x | 0 | 1 | 2 | -5 | -1 | 3 | (26÷3)
y | 7 | 4 | 1 | 22 | 10 | -2 | -19
c) x-4y = 1
x | 5 | 9 | 2 | 1 | 0 | -11
y | 1 | 2 | (1÷4) | 0 | (1÷4) | -3
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a) x+y = 27
x | 1 | 3 | 7 | 11 | 15 | 20 | 24
y | 26 | 24 | 20 | 16 | 12 | 7 | 3
b) 3x+y = 7
x | 0 | 1 | 2 | -5 | -1 | 3 | (26÷3)
y | 7 | 4 | 1 | 22 | 10 | -2 | -19
c) x-4y = 1
x | 5 | 9 | 2 | 1 | 0 | -11
y | 1 | 2 | (1÷4) | 0 | (1÷4) | -3