Odpowiedź:
a)
[tex]\left \{ {{x+3y=0/*(-2)} \atop {2x-y=7}} \right.[/tex]
[tex]\left \{ {{-2x-6y=0 \atop {2x-y=7}} \right.[/tex]
----------------------
-7y=7/:(-7)
y=-1
x+3*(-1)=0
x=3
(x,y)=(3,-1)
b)
[tex]\left \{ {{x=3} \atop {5x=3-12y}} \right.[/tex]
[tex]\left \{ {{x=3} \atop {5*3-3=-12y}} \right.[/tex]
[tex]\left \{ {{x=3} \atop {15-3-3=-12y}} \right.[/tex]
[tex]\left \{ {{x=3} \atop {12=-12y/:12}} \right.[/tex]
[tex]\left \{ {{x=3} \atop {y=-1}} \right.[/tex]
(x,y)=(3,-1)
a)
3x+y=5
para (1 i 2),( 0 i 5),(2 i (-1))
b)
x-2y=-3
para (-1 ,1 ),(1 ,2), (3,3)
c)
x=y
para (1,1), (2,2), (3,3)
Szczegółowe wyjaśnienie:
