b] -3x = 3y+1 |*(-1/3) y = 4x - 8 x = -y - 1/3 y = 4(-y - 1/3) x = -y - 1/3 5y = -4/3 | : 5 x = y - 1/3 y = -4/15 x = -4/15 - 5/15 = - 9/15 y = -4/15 c] - 5x = 7 - 3y | *( - 1/5) 3y = 5x | : 3 x = -7/5 - 3/5y y = 5/3x x = -7/5 - 3/5*(5/3x) y = 5/3 * (-7/5 - 3/5y) x = 7/5 - x y = -7/3 - y 2x = 7/5 | :2 2y = -7/3 | :2 x = 7/10 y = -7/6 d] 6x = 10-4y | :6 2-2/5y -3/5x = 0 x = 10/6 - 2/3y -2/5y = 3/5x -2 |:- 2/5 x = 10/6 - 2/3y y = -3/2x + 5 x = 10/6 - 2/3(-3/2x + 5) y = -3/2 (10/6 -2/3y) x = 10/6 + x - 10/3 y = - 10/4 + y x - x = - 10/6 - sprzeczne y - y = - 10/4 - sprzeczne e] -10x - 4y + 8x + 4y = 1 |*-1/2 6x - 3y - y - 7x = 5/5 | * -1/4 x = -1/2 y = - 55/40 - 1/4x x = -1/2 y = -55/40 - 1/4*-1/2 x = -1/2 y-55/40 + 5/40 = - 50/40 f] najpierw mnożę wszystko przez 2 i wychodzi tak 2x - y/4+3x+5 = 6 | * 4 + 3x + 5 najpierw mnożę wszystko przez 10 i wychodzi tak x - 7/5 - 2y + x = -10 | * 5 - 2y + x 2x - y = 24 + 18x + 30 | * - 1 x - 7 = -50 + 20y - 10x| : 11 y = 24 - 16x - 30 x = -43/11 + 20/11 (24 - 16x - 30) y = 24 - 16 (-43/11 + 20y) - 30 x = -43/11 + 480/11 - 320/11x - 720/11 y = 688/11 - 320y - 6 331/11x = -283/11 | * 11 321y = 622/11 | * 1/321 331x = 622 | : 331 y = 662/3531 x = 622/331
