rozwiąż równanie metodą przeciwnych współczynników :
{2x-y=-10
{2x-3y=-18
2x-y = -10 I*(-3)
2x-3y = -18
-6x+3y = 30
2x-3y = -18
---------------- +
-4x = 12 /:(-4)
x = -3
=====
2x-y = -10
x = -3
-y = -10-2x
y = 10+2x = 10+2(-3) = 10-6 = 4
y = 4
====
{x = -3}
{y = 4}
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