Question

zad 38 str 73

c) 2x+1=7-x

18-7y=-2y-57

0,8z + 6 = z+24

a-4= 2/3a - 8

6 4/5 = 1/7b - 1/5

proszę ja to potrzebuje na jutro plisssss

Answer 1

2x+1 = 7-x

2x+x = 7-1

3x = 6 / :3

x = 2

 

18-7y = -2y-57

-7y+2y = -57-18

-5y = -75 / :(-5)

y = 15

 

0,8z+6 = z+24

0,8z - z = 24 - 6

-0,2z = 18 / :(-0,2)

z = -90

 

a-4 = 2/3a-8

a-2/3a = -8+4

1/3a = -4 / *3

a = -12

 

6 4/5 = 1/7b-1/5

34/5+1/5 = 1/7b

35/5 = 1/7b

7 = 1/7b / *7

b = 49

 

 

Answer 2

2x+1=7-x

2x+x=7_1

3x=6:3

x=2

 

 

18-7y=-2y-57

-7y+2y=-57-18

-5y=-75:(-5)

y=15

 

 

0,8z+6=z+24

0,8z-z=24-6

-0,2z=18:(-0,2)

z=-90

 

a-4=2/3a-8

a-2/3a=-8+4

3/3a-2/3a=-4

1/3a=-4:1/3

a=12

 

 

34/5=1/7b-1/5

-1/7b==1/5-34/5

-1/7b=-7:(-1/7)

b=49