ROZWIĄŻ UKŁADY RÓWnan: {6-2y=5 {3x+y-4,5=0 {4a-7b=-19 {3a+2b=22 {2x+y=2 {4x+2y=4

1) {-2y=-1 {y-4,5=-3x {y=0,5 {0,5-4,5=-3x {y=0,5 { -4=-3x {y=0,5 { 0,75=x 2) {4a-7b=-19 {3a+2b=22 /*3,5 {4a-7b=-19 {10,5a+7b=77 +___________________ 14,5a = 58 a= 4 {12 + 2b = 22 { 2b= 10 {b = 5 3) {2x+y= 2 /*-2 {4x+2y=4 {-4x - 2y = -4 { 4x +2y = 4 +______________ 0= 0

{6-2y=5 : 2 {3x+y-4,5=0 {3-y=2,5 {3x+y=4,5 y się skracają {3x = 3 :3 x=1 {4a-7b=-19 *3 {3a+2b=22 *(-4) {12a-21b=-57 {-12a-8b=-88 -29b=-145 :29 b=5 {2x+y=2 * (-2) {4x+2y=4 {-4x-2y=-4 {4x+2y=4 0=0

6-2y=5 3x+y-4,5=0/+4,5 6-2y=5/-6 3x+y=4,5 -2y=-1/:1 3x+y=4,5/-3x 2y=1 y=4,5-3x 2y=1 y=4,5-3x 2(4,5-3x)=1 y=4,5-3x 9-6x=1/-9 y=4,5-3x -6x=-8/:-6 y=4,5-3x x=1,3 y=4,5-3*1,3 x=1,3 y=4,5-3,9 x=1,3 y=0,6 2) {4a-7b=-19 {3a+2b=22 /*3,5 {4a-7b=-19 {10,5a+7b=77 +___________________ 14,5a = 58 a= 4 {12 + 2b = 22 { 2b= 10 {b = 5 3) {2x+y= 2 /*-2 {4x+2y=4 {-4x - 2y = -4 { 4x +2y = 4 +______________ 0= 0