Odpowiedzi

2009-12-14T18:52:01+01:00
A)
4y-x=6
17y=0 / :17

4y-x=6
y=0

0-x=6 /:-1
y=0

x=-6
y=0


b)
a=b
2a+b=9

a=b
2b+b=9

a=b
3b=9

a=b
b=3

a=3
b=3

c)
u=4v
5u-v=10

u=4v
5(4v)-v=10

u=4v
19v=10

u=4v
v=10/19

u=40/19
v=10/19

d)
3r=s
3r+s=24

3r=s
3r+3r=24

3r=s
6r=24

3r=s
r=4

s=12
r=4

e)
2x-y=10
x+5y=-17

2x-y=10
x=-17-5y

2(-17-5y)-y=10
x=-17-5y

-34-10y-y=10
x=-17-5y

-11y=44 /:-11
x=-17-5y

y=-4
x=-17-5(-4)

x=3
y=-4