x - 2y = 5
3x - y = 5 | *(-2)
-6x + 2y = -10
Складываем два уравнения:
-5x = -5
y = 3x - 5
x = 1
y = 3 - 5 = -2
7x + 8y = 7*1 + 8*(-2) = 7 - 16 = -9
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x - 2y = 5
3x - y = 5 | *(-2)
x - 2y = 5
-6x + 2y = -10
Складываем два уравнения:
-5x = -5
y = 3x - 5
x = 1
y = 3 - 5 = -2
7x + 8y = 7*1 + 8*(-2) = 7 - 16 = -9