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x=y /razy (-8)
8x-y=7
-8x= -8y
8x-y=7
0=-8y
7=y
7=-7y
-7y=7 /:(-7)
y=-1
3) nie spełnia
x=y
8x-y=7
x+y=0
8x-y=7
x=0-y
8*(0-y)-y=7
x=0-y
0-8y-y=7
x=0-y
-9y=7 /:(-9)
x=0-y
y= - 7/9
x= -7/9
y= -7/9
zad2
x+2y=8
Przykładowe: x=4 , y=2
zad3
x-2y=8
3x+y=3
2- 2* (-3) =8
3* 2 + (-3) =3
2+6=8
6+ (-3)= 3
8=8
3=3
x=y
8x-y=7
x=y
8y-y=7
x=y
7y=7
x=y
y=1
x=1
y=1
2.
x+2y=8
np.
x=2 y=2 2+2*2=8 8=8
np.
x=6 y=1 6+2*1=8 8=8
3.
Podstawiam:
2-2*(-3)=8
3*2+(-3)=3
2-(-6)=8
6-3=3
8=8
3=3
Pozdrawiam ;*