Rozwiąż algebraicznie i graficznie układ równń.
{3x-y=3
{x-3y=-15
Dam naj.
3x - y = 3 /*(-3)
x - 3y = -15
-9x + 3y = -9
x - 3y = -15
---------------------
-8x = -24
x = 3
x - 3y = -15
3 - 3y = -15
-3y = -15 - 3
-3y = -18
y = 6
x = 3
y = 6
3x - y = 3 /*(-3)
x - 3y = -15
-9x + 3y = -9
x - 3y = -15
-8x = -24
x = 3
x - 3y = -15
3 - 3y = -15
-3y = -15 - 3
-3y = -18
x = 3
y = 6