Układy równań: 1.{2x=y+5 {2x=2y+7 2.{x-28=y {x-2=3(s-2) 3.{x+y=3,5 _______ 2 {x+1=y-2

{2x=y+5 {2x=2y+7 {2x=y+5 {y+5=2y+7 {2x=y+5 {-y=2 /*(-1) {2x=y+5 {y=-2 {2x=-2+5 {y=-2 {2x=3 /:2 {y=-2 {x=1½ {y=-2

1. {2x=y+5 {2x=2y+7 y=5-2x 2x=2*(5-2x)+7 y=... 2x=10-4x+7 y=... 2x+4x=17 y=... 6x=17 / 6 x= 17/6 x=2 5/6 y=5-2x x=... y=5-2*(2 5/6) x=... y=5-5 5/6 x=... y=-1/6 (2 5/6, -1/6)