3/176 rozwiąż równania: a.x+2x=x+9 b.y+2y-5=11-y c.3a+4=a-1+a+7 d.10-2b+6-b=1-b+4-b pomóżcie !

sylwia0906

a. x + 2x = x +9 3x= x +9 3x - x = 9 2x= 9 / :2 x = 4,5 b.y + 2y - 5= 11-y 3y= 11 -y + 5 3y + y = 16 4y= 16/:4 y=4 c.3a+4=a-1+a+7 3a -a - a= -1 +7 -4 a=6-4 a=2 d.10-2b+6-b=1-b+4-b 10 - 3b +6= 5 - 2b -3b+2b= 5 -10-6 -b= -11/: ( -1) b= 11

citizen

x+2x=x+9 I -x 2x = 9 I :2 x = 4,5 y+2y-5=11-y I +y 4y-5 = 11 I +5 4y = 16 I :4 y = 4 3a+4=a-1+a+7 I -2a a + 4 = 1+7 I -4 a = 4 10-2b+6-b=1-b+4-b I - 10 -2b+6-b = 1-b-6-b I -6 -3b = -b-6-b I +b -2b = -6-b I +b -1b = -6 I :1 b = -6

alicja181

a)x+2x=x+9 I -x 2x = 9 I :2 x = 4,5 b)y+2y-5=11-y I +y 4y-5 = 11 I +5 4y = 16 I :4 y = 4 c)3a+4=a-1+a+7 I -2a a + 4 = 1+7 I -4 a = 4 d)10-2b+6-b=1-b+4-b I - 10 -2b+6-b = 1-b-6-b I -6 -3b =-b-6-b I +b -2b =-6-b I +b -1b =-6 I :1 b=-6