Odpowiedzi

2010-04-08T17:16:04+02:00
A)
2x=6+5y
3x-4y=2

x=3+⁵/₂y
3(3+⁵/₂y)-4y=2

x=3+⁵/₂y
9+15/₂y-4y=2

x=3+⁵/₂y
15/₂y-⁸/₂y=-7

x=3+⁵/₂y
⁷/₂y=-7

x=3+⁵/₂y
y=-2

x=-2
y=-2

b)
5x=3y
3x+2y=4

x=³/₅y
3(³/₅y)+2y=4

x=³/₅y
⁹/₅y+2y=4

x=⅗y
⁹/₅y+¹⁰/₅y=4

x=⅗y
¹⁹/₅y=4

x⅗y
19y=20

y=²⁰/₁₉
x=¹²/₁₉

c)