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

C) -x-y=2 2(3y+x)=-20 -x-y=2 | * 2 6y+2x=-20 -2x-2y=4 6y+2x=-20 4y=4 | : 4 6y+2x=-20 y=1 6 * 1 + 2x=-20 y=1 6+2x=-20 y=1 2x=-20-6 y=1 2x=-26 y=1 x=-13 a) x+2y=9 y-1=3x | * (-2) x+2y=9 -2y +2=-6x -5x=11 |: (-5) y-1=3x x=-2,2 y=1+ 3 * (-2,2) x=-2,2 y=1-6,6 x=-2,2 y=-5,6