zadanie 3/101 Rozwiąż układy równań a) 2x- 1/2y= 3 y- 4x = -6 b) x-y+ 3 -5x + 10y= -10 c) 6x + y= 3 3x +1/2y= 5 d) x-2y = -4 0,5x + y= 2

a) 2x-½y= 3 y- 4x = -6 {2x-½y=3/*2 {-4x+y=-6 {4x-y=6 {-4x+y=6 ~~~~~~~~~~~~ ____0=0 b) x-y= 3/*5 -5x + 10y= -10 {5x-5y=15 {-5x+10y=-10 ````````````` _____5y=5/:5 _______y=1 x-y=3 x-1=3 x=4 {x=4 {y=1 c) 6x + y= 3 3x +½y= 5/*(-2) {6x+y=3 {-6x-y=-10 ``````````` ____0≠-7 d) x-2y = -4 0,5x + y= 2/*2 {x-2y=-4 {x+2y=4 `````````` __2x=0/:2 __x=0 x-2y=-4 -2y=-4/:(-2) __y=2 {x=0 {y=2

a) 2x- 1/2y= 3 y- 4x = -6 y=4x-6 2x-1/2(4x-6)=3 0=0 b) x-y= 3/*5 5x-5y=15 -5x + 10y= -10 5y=25 y=5 x-y=3 x=8 c) 6x + y= 3 3x +1/2y= 5/*-2 -6x-y=-5 0=8 rownanie sprzeczne d) x-2y = -4 0,5x + y= 2/*2 x+2y=4 2x=0/:2 x=0 y=2