Question

na jutro !

układy równań str.38 zad.4e (3gim)

2(x+y)-(x-1)=y+2

x+y=1

zad.37 str.45 (3gim)

a)

x+2y=9

y-1=3x

b)

x-y=2

x-1=

c)

-x-y=2

2(3x+y)=-20

d)

4x+3y=54

Answer 1

Zad 4 e 2(x+y)-(x-1)=y+2 x+y=1 2x+2y-x+1=y+2 x+y=1 x+2y+1=y+2 |-1-y x+y=1 x+y=1 x+y=1 |*-1 x+y=1 /+ -x-y=-1 /+ 0=0 zad 37 a) x+2y=9 y-1=3x |-y x+2y=9 -1=3x-y |*2 x+2y=9 /+ 6x-2y=-2 /+ 7x=7 |:7 x=1 x=1 1+2y=9 |-1 x=1 2y=8 |:2 x=1 y=4 b) x-y=2 1/2x-1=1/4y |*4 x-y=2 2x-4=y |+4-y x-y=2 |*-1 2x-y=4 -x+y=- 2 /+ 2x-y=4 /+ x=2 2-y=2 |-2 x=2 -y=0 |*-1 x=2 y=0