Question

Zadanie 2 strona 176 MATEMATYKA Z PLUSEM 1 GIMNAZJUM

A)-3x=2x - 10

-3x-2x=-10

-5x=-10 | : (-5)

B)2x-2=7-x

2x+x=7+2

3x=9 | : 3

x=3

Answer 1

c) 10 = 4 -2x

2x = 4 -10

2x = -6 / :2

x = -3

 

d)- (2x - 1) = 4

-2x+1 = 4 

-2x = 4 - 1

-2x = 3 /: (-2)

x = 1,5

 

e) 2(x + 1) = x

2x + 2 = x

2x - x = -2

x = -2

 

f) 2t - (3t + 1) = 6

2t -3t -1 = 6

-t = 6 + 1

-t = 7 

 

g) -(4+x) = 2(3 - x)

-4 -x = 6 -2x

-x + 2x = 6 + 4

x = 10

 

h)3(y+6) - y = 2(y+9)

3y + 18 - y = 2y + 18

3y - y - 2y = 18 - 18

0=0

 

i) (x - 7) -2(3x + 5) = 3

x - 7 -6x - 10 = 3

x - 6x = 3 +7 +10

-5x = 20 /:(-5)

x = -4

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Nie jestem pewna, ale prosze ; ))