Rozwiąż układy równań: b) {x-y=2 {1/2x-1=1/4y c) {-x-y=2 {2(3x+y)=-20 d) {4x+3y=54 {1/3x=4(1+1/8y)

b) {x-y=2 {1/2x-1=1/4y /*(-2) {x-y=2 {-x+½y=-2 ___________ -½y=0 y=0 x=2 c) {-x-y=2 {2(3x+y)=-20 {-6x-6y=12 {6x+2y=-20 __________ -4y=-8 y=2 x=-4 d) {4x+3y=54 {1/3x=4(1+1/8y) /*12 {4x+3y=54 {-4x+6y=-48 ___________ 9y=6 y=⅔ x=13 chyba dobrze jak cos to pisz do mnie;) pozdrawiam Kromcia

b) x-y=2 1/2x-1=1/4y x=2+y 1/2y+1-1=1/4y x=2+y y=0 x=2 y=0 c)-x-y=2 6x+2y=-20 x=-2-y -12-6y+2y=-20 x=-2-y -4y=-8 x=-2-y y=2 x=-4 y=2 d)4x+3y=54 1/3x=4+1/2y 4x+3y=54 2x-3y=24 ------------- 6x=78 x=13 4x+3y=54 3y=54-52 3y=2 y=2/3 x=13 y=2/3