a) x + 3y = 3 x - y = 5 x+3y=3 x=5+y 5+y+3y=3 x=5+y 4y=3-5 4y=-2 y=-0,5 x=5+y x=5-0,5 x=4,5 b)3m + n = 9 2m - 5n = -11 n=9-3m 2m-5(9-3m)=-11 n=9-3m 2m-45+15m=-11 n=9-3m 17m=34 n=9-3m m=2 n=9-3*2 n=9-6 n=3 c)5x = 4 - 2y 4x + y = 3 5x=4-2y y=3-4x 5x=4-2(3-4x) y=3-4x 5x=4-6+8x y=3-4x -3x=-2 y=3-4x x i y mam nadzieje że wyliczysz
a) x + 3y = 3 x - y = 5 x= 3 - 3y 3 - 3y - y = 5 x= 3 - 3y -4y = 2 / :(-4) x= 3 - 3y y= - ½ x - 1,5 = 3 y= - ½ x= 4,5 y= - ½ b) 3m + n = 9 2m - 5n = -11 n= 9- 3m 2m - 45 + 15m = -11 n = 9 - 3m 17m = 34 / :17 n = 9 - 3m m= 2 n = 9 - 6 m = 2 n= 3 m= 2 c) 5x = 4 - 2y 4x + y = 3 y= 3-4x 5x + 2y = 4 y= 3-4x 5x + 6 - 8x = 4 y= 3-4x -3x = -2 /: (-3) y= 3-4x x= 2/3 y= 3- 2 i 2/3 x = 2/3 y= 1/3 x= 2/3 d) 2x - y = 10 x + 5y = -17 -y = 10 - 2x / × (-1) x + 5y = -17 y= -10 + 2x x - 50 + 10x = -17 y= -10 + 2x 11x = 33/ :11 y= -10 + 2x x= 3 y= -10 + 6 x=3 y= -4 x= 3 e) 4a - 2 = b 3a + 7b = 1,5 b= 4a -2 3a + 28a - 14 = 1,5 b= 4a -2 31a = 15,5 / : 31 b= 4a -2 a= 1/2 b= 2 - 2 a = 1/2 b= 0 a= 1/2 f) 6x - 3y = 9 x + 5y = 9,5 x= 9,5 - 5y 57 -30y - 3y = 9 x= 9,5 - 5y -33y=-48 x= 9,5 - 5y y≈ 1,5 x= 9,5 - 7,5 y≈ 1,5 x= 2 y≈ 1,5
