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7 - 3x + y = 0
4x + y = 7
-3x + y = -7 |*(-1)
4x + y = 7
3x - y = 7
4x + y = 7
-------------- +
7x = 14 /:7
x = 2
y = 7 - 4*2
y = -1
{x = 2
{y = -1
b)
2x - y = 8
y - x = 2(x - 4) - x
2x - y = 8
y - x = 2x - 8 - x
2x - y = 8
-2x + y = -8
---------------- +
0 = 0 - równanie tożsamościowe, nieskończenie wiele rozwiązań