Question

a)8x+5=7x

b)7n+2=6n-3

c)-x+25+2x-2

d)-9z-7+-z-6

e)25m-3+24m-4

f)-s+15=4s-14

g)17y+28=19y+27

h)8k-19+8k+19

Answer 1

a)

8x + 5 = 7x

8x-7x=-5

x=-5

b)

7n + 2 = 6n - 3

7n-6n=-3-2

n=-5

c)

-x + 25 = 2x - 4

-x-2x--4-25

-3x=-29/:(-3)

x=9 2/3

d)

-9z - 7 = -z -6

-9z+z=-6+7

-8z=1/:(-8)

z=-1/8

e)

25m - 3 = 24m - 4

25m-24m=-4+3

m=-1

f)

-s + 15 = 4s - 14

-s-3s=-14-15

-4s=-29/:(-4)

s=7 1/4

g)

17y + 28 = 19y + 27

17y-19y=27-28

-2y=-1/:(-2)

y=1/2

h)

8k - 19 = -8k + 19

8k+8k=19+19

16k=38/:16

k=2 3/8

 

LICZE NA NAJ