Řeš v ℝ × ℝ soustavu rovnic:
–x + y = 2
\large y = 3
x = 0
\large K = \left \{ {\left[ {0;3} \right] } \right \}
x = 2
\large K = \left \{ {\left[ {2;3} \right] } \right \}
x = -1
\large K = \left \{ {\left[ {-1;3} \right] } \right \}
x = 1
\large K = \left \{ {\left[ {1;3} \right] } \right \}
