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a) 15ab-6b= 3b(5a-2)
Zad. 3
a) 2x-y=4
x+2y=7
x=7-2y
2(7-2y)-y=4
14-4y-y=4
10=5y
y=2 x= 7-2*2=3
b) 4x-3y=3 / *2
5x+2y=4,5/ *3
8x-6y=6
15x+6y=13.5
dodajemy stronami:
23x=19.5
x=19.5/23
4(19.5/23)-3y=3
78/23-3y=3
147/23=3y /:3
49/23=y