Odpowiedzi

2009-12-11T13:53:57+01:00
A)2x - y = 5
2x=5+y/:2
x=5/2+1/2 y
b)1/3y = x - 3
-x=-3-1/3y/:(-1)
x=3+1/3y
c) 3 ( x-y ) = 2x
3x-3y=2x
3x-2x=3y
x=3y
d)2/3x = 3/4y/:3/2
x=9/8y
e)4x + 2y = 1
4x=1-2y/:4
x=(1-2y):4
f)6x - 2/3y = 2
6x=2+2/3y/:6
x=1/3+1/9y
2009-12-11T13:54:24+01:00
A)2x - y = 5
2x=y+5
x=(y+5)/2

b)1/3y = x - 3
x= ⅓y +3

c) 3( x-y ) = 2x
3x-3y=2x
x=3y

d)2/3x = 3/4y /obustronnie * 3/2
x=9/8y

e)4x + 2y = 1
4x=1-2y
x=(1-2y)/4

f)6x - 2/3y = 2
6x= ⅔y +2
x= (⅓y + 1)/3