A){x-3(y-3x)=3x-4 {2(2x-y)=4 { X- 3Y- 9X = 3X-4 4X-2Y = 4 {-8X-3X-3Y = -4 4X-2Y = 4 {-12X - 3Y = -4 / -2 4X - 2Y = 4 / 3 {24X + 6Y = 8 12X - 6Y = 12 36X = 20 / 36 X = 20/36 -> 0,5 ( W PRZYBLIŻENIU) X= 20/36 4X - 2Y = 4 4* 0,5 - 2Y = 4 2-2Y = 4 / -2 2Y = 2 / :2 Y = 1 B) {3(2+y)=-2x-1 {2(x+1)=2-10y {6+3Y = 2X-1 2X+2 = 2-10Y { -2X+3Y = -7 2X+10Y =0 13Y = -7 / 13 Y =-7/13 - > -0,53 (W PRZYBLIŻENIU ) { Y = -7/13 2X + 2 = 2-10Y { Y = -7/13 2X + 2 = 2 - 10* -0.53 2X = 2- 5,38 - 2 2X = -3,38 - 2 2X = - 5,38 / 2 X = - 2,69
a) {x-3(y-3x)=3x-4 {2(2x-y)=4 { X- 3Y- 9X = 3X-4 4X-2Y = 4 {-8X-3X-3Y = -4 4X-2Y = 4 {-12X - 3Y = -4 / -2 4X - 2Y = 4 / 3 {24X + 6Y = 8 12X - 6Y = 12 36X = 20 / 36 X = 20/36 X= 20/36 4X - 2Y = 4 4* 0,5 - 2Y = 4 2-2Y = 4 / -2 2Y = 2 / :2 Y = 1 B) {3(2+y)=-2x-1 {2(x+1)=2-10y {6+3Y = 2X-1 2X+2 = 2-10Y { -2X+3Y = -7 2X+10Y =0 13Y = -7 / 13 Y =-7/13 - > -0,53 (W PRZYBLIŻENIU ) { Y = -7/13 2X + 2 = 2-10Y { Y = -7/13 2X + 2 = 2 - 10* -0.53 2X = 2- 5,38 - 2 2X = -3,38 - 2 2X = - 5,38 / 2 X = - 2,69