rozwiaz uklad rownan , stosujac odpowiednie podstawienie np w punkcie a/ podstawienie : x+y = u i x-y=t
½ (x+y) - (x-y)/4=-1
3(x+y) -½(x-y) = 2
to pogrubione to kreska ulamkowa u gory jest x-y a na dole 4
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{½ (x+y) - (x-y)/4=-1 |*(-4)
{3(x+y) -½(x-y) = 2 |*2
{-2(x+y) + x - y = 4
+{6(x+y) - x + y = 4
4(x+y) = 8
x + y = 2
x = 2-y
-2(2-y+y) + 2 - y - y = 4
-2 - 2y = 4
-2y = 6
y = -3
x = 2 - (-3)
x = 5