a) {x-3y=4 {-x+y=1 -2y=5 | :(-2) y=-2.5 b){2x-4y=6 {-x+y=1 | *2 2x-4y=6 -2x+2y=2 -2y=8 | :(-2) y=-4 c) {2x+3y=4 {x+2y=3 | * (-2) 2x+3y=4 -2x-4y=-6 -y =-2 | :(-1) y=2
a) {x-3y=4 {-x+6y=1 [x=4+3y [-(4+3y)+6y=1 {x=4+3y {-4-3y+6y=1 [x=4+3y [3y=5/:3 {x=4+3y {y≈1,666 [x=4+3*1,666 [y≈1,666 {x≈8,998 b) {2x-4y=6/:2 {-x+y=1 [x-2y=3 [-x+y=1 {x=3+2y {-(3+2y)+y=1 [x=3+2y [-3-2y+y=1 {x=3+2y {-y=4/*(-1) [x=3+2y [y=-4 {x=3+2*(-4) {y=-4 [x=-5 [y=-4 c) {2x+3y=4/:2 {x+2y=3 [x+1,5y=2 [x+2y=3 {x=2-1,5y {2-1,5y+2y=3 [x=2-1,5y [0,5y=1/:0,5 {x=2-1,5y {y=2 [x=2-1,5*2 [y=2 {x=-1
Ja ci w tym POMOGĘĘ ;D historia = np. 2/3 to ułamek ;D * - razy, iloczyn b) {2x-4y=6 a) {x-3y=4 -x+y=1 /*(-1) -x+6y=1 /*(-1) {2x-4y=6 {x=4+3y x=-1+y x-6y=-1 {2(-1+y)-4y=6 {x=4+3y x=-1+y 4+3y-6y=-1 {-2+2y-4y=6 {x=4+3y x=-1+y -3y=-5 /:(-3) {-2y=6+2 /:(-2) {x=4+3y x=-1+y y=1 2/3 {y=-4 {x=4+3*1 2/3 x=-1-4 y=1 2/3 {x=-5 {x=4+5 {y=-4 y=1 2/3 {x=9 y=1 2/3 c) {2x+3y=4 x+2y=3 {2x+3y=4 x=3-2y {2(3-2y)+3y=4 x=3-2y {6-y=4 x=3-2y {-y=-2 /*(-1) x=3-2y {y=2 x=3-4 {x=-1 {y=2 Liczę na Naj ;D