Verified answer

Réponse:

a)x-3=-1

x-3+3=-1+3

x=-1+3

x=2

b) 2y =5

2y/2 = 5/2

y=5/2

c) 5x = 2x+9

5x-2x=2x+9-2x

3x=2x+9-2x

3x=9

3x/3 = 9/3

x=3

d)5x + 7 = 2x - 2

5x+7-7=2x-2-7

5x=2x-9

5x-2x=2x-9-2x

3x=-9

3x/3=-9/3

x= -3

e)2x - 5 = 5x+1

2x-5+5=5x+1+5

2x=5x+1+5

2x=5x+6

2x-5x=5x+6-5x

-3x=6

-3x/-3 = 6/-3

x=-2

f)3-7x = 3x+2

-7x+3=3x+2

-7x+3-3=3x+2-3

-7x=3x+2-3

-7x=3x-1

-7x-3x=3x-1-3x

-10x=3x-1-3x

-10x=-1

x= 1/10

i) 4 (a + 1) - 5 = 6a+ 5

4a+4-5=6a+5

4a-1=6a+5

4a-1+1=6a+5+1

4a=6a+6

4a-6a=6a+6-6a

-2a=6

-2a/-2=6/-2

a=-3

k) (x − 3)² = x (x - 5)

x^2-6x+9=x^2-5x

-6x+5x=-9

x=9

voilà j'espère que ça va t'aider !!!