Question

calcule o valor de x de modo que A) 2x+3=15B) 7x-1=13C) 2x-4=3D) 4x+2= -18E) 5x-2= 7+6F) 10x+1= -4-5

Answer 1

A)2x+3=15
2x=15-3
2x=12
x=12/2     =>  x=6

B)7x-1=13
7x=13+1
7x=14
x=14/7       => x=2

C)2x-4=3
2x=3+4
2x=7
x=7/2         ou x= 3,5

D)4x+2=-18
4x=-18-2
4x=-20
x=-20/4        =>x= -5

E)5x-2=7+6
5X=7+6+2
5X=15
X=15/5      =>X = 3


F)10x+1=-4-5
10x+1=-9
10x=-9-1
10x=-10
x=-10/10             =>x= -1

Answer 2

a)
2x +3=15
2x =15-3
2x =12
x = 12 /2
x = 6

b )
7x-1 = 13
7x = 13 + 1
7x = 14
x = 14/7
x = 2

c)
2x-4 = 3
2x = 3+4
x = 7 / 2
x = 3,5 ou 7/2


d)
4x + 2 = -18
4x = -18 -2
x = -20 / 4
x = -5

e)
5x- 2 = 7 + 6
5x - 2 = 13
5x = 13 + 2
x = 15 / 5
x = 3

f)
10x + 1 = -4 -5
10x + 1 = -9
10x = -9 -1
10x = -10
x = - (10/10)
x = -1