Question

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 !

Answer 1

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

Answer 2

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

Answer 3

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