Question

Matematyka 2001, 1 gimnazjum zadanie 15 i 16/177

a) -2x + 4 = 5x + 25

b) 7y - 8 = -y + 24

c) -8z + 5 = -z - 1

d) -2m + 7 = m - 6

e) 6 - 5x = 2x - 7

f) -5t + 1 = 8 - 6t

16.

a) 5x + 4= 4x - 11

b) 6y - 1 = y +9

c) - 2 + 5 = 3z - 25

Answer 1

a) -2x + 4 = 5x + 25

-2x-5x=25-4

-7x=21/:(-7)

x=-3

b) 7y - 8 = -y + 24

7y+y=24+8

8y=32/:8

y=4

c) -8z + 5 = -z - 1

-8z+z=-1-5

-7z=-6/:(-7)

z=6/7

d) -2m + 7  = m - 6

-2m-m=-6-7

-3m=-13

m=3/13

e) 6 - 5x = 2x - 7

-5x-2x=-7-6

-7x=-13

x=7/13

f) -5t + 1 = 8 - 6t

-5t+6t=8-1

t=7

 

16.

a) 5x + 4= 4x - 11

5x-4x=-11-4

x=-15

b) 6y - 1 = y +9

6y-y=9+1

5y=10/:5

y=2

 

 

Answer 2

zad.15.

 

a) -2x + 4 = 5x + 25
-2x-5x=25-4
-7x=21/:(-7)
x=-3

b) 7y - 8 = -y + 24
7y+y=24+8
8y=32/:8
y=4

c) -8z + 5 = -z - 1
-8z+z=-1-5
-7z=-6/:(-7)
z=6/7

d) -2m + 7 = m - 6
-2m-m=-6-7
-3m=-13/:(-3)    
m=3/13

e) 6 - 5x = 2x - 7
-5x-2x=-7-6
-7x=-13/:(-7)
x=7/13

f) -5t + 1 = 8 - 6t
-5t+6t=8-1
t=7


zad.16.

a) 5x + 4= 4x - 11
5x-4x=-11-4
x=-15

b) 6y - 1 = y +9
6y-y=9+1
5y=10/:5
y=2

 

 

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