ex 2
(1) x - y = 7
(2) x + 2 + y + 5 = 10 => x + y + 7 = 10
(1) + (2) = x - y + x + y + 7 = 7 + 10
2x + 7 = 17
2x = 10
x = 5
et y = 5 - 7 = - 2
5 - (-2) = 7
et
(5+2) + (-2 + 5) = 7 + 3 = 10
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ex 2
(1) x - y = 7
(2) x + 2 + y + 5 = 10 => x + y + 7 = 10
(1) + (2) = x - y + x + y + 7 = 7 + 10
2x + 7 = 17
2x = 10
x = 5
et y = 5 - 7 = - 2
5 - (-2) = 7
et
(5+2) + (-2 + 5) = 7 + 3 = 10