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3x + y = 27
x/y = 2/3 /*y
3x + y = 27 (2)
x=⅔y (1)
(1) wstawiam do (2):
3*⅔y+y=27
3y=27 /:3
y=9 (3)
(3) wstawiam do (1):
x=⅔*9
x=6
x=6
y=9
UKŁAD OZNACZONY (6;9)
x/y = 2/3
3x + y = 27
x=2/3y
3*2/3y+y=27
x=2/3y
3y=27/3
x=2/3y
y=9
x=2/3*9
y=9
x=6
:))