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10x + y = 10y + x + 18
x - y = 2
10x - x + y - 10y = 18
x - y = 2
9x - 9y = 18 /:(-9)
x - y = 2
-x + y = -2
x - y = 2
----------------- +
0 = 0, równanie nieoznaczone, nieskończenie wiele rozwiązań
2.
x + x + y = 700
y + y + x = 620
2x + y = 700 |*(-2)
x + 2y = 620
-4x - 2y = -1400
x + 2y = 620
----------------------- +
-3x = -780 /:(-3)
x = 260
y = 700 - 2*(260) = 700 - 520
y = 180
{x = 260
{y = 180
3.
5w + 35 = 220 /:5
6w + 5s = 320
w + 7 = 44
6w + 5s = 320
w = 44 - 7
6w + 5s = 320
w = 37
5s = 320 - 6·37 = 320 - 222
5s = 98 /:5
s = 19,6
{s = 19,6
{w = 37