{5x-7y=3 {2x-3y=7 {4x-5y=5 {6x-7y=9 {7x+7y=21 {2x+5y+8=14 {6x-9y=6 {8x+5y=7/3 {5x-y=7 {2(x+1)=2y

mam nadzieje ze dobrze;] 1. {5x-7y=3 /*2 {2x-3y=7 /*(-5) {10x-14y= 6 +{-10x+15y=-35 y=-29 2x-3(-29)=7 x=-40 {x=-40 {y=-29 2. {4x-5y=5 /*6 {6x-7y=9 /*(-4) {24x-30y=30 +{-24x+28y=-36 -2y=-6 y=3 6x-7y=9 6x-7*3=9 x=6 {x=6 {y=3 3. {7x+7y=21 {2x+5y+8=14 {-14x-14y=-42 +{14x+35y+56=98 21y=56=56 y=0 2x+5*0+8=14 x=3 {x=3 {y=0 4. {6x-9y=6 /*8 {8x+5y=7/3 /*(-6) {48x-72y=48 {-48x-30y=-14 -102y=34 y=34/102 6x-9(34/102)=6 6x=6+306/102 6x=6+3 x=2/3 {x=2/3 {y=34/102 5. {5x-y=7 {2(x+1)=2y {y=-7+5x {2x+2=2(-7+5x) {y=-7+5x {2x+2=-14+10x {y=-7+5x {-8x=-16 {x=2 {y=3