Question

Calcule o valor de x de modo que:
a) 2x+3=15
b) 7x-1=13
c) 2x-4=3
d) 4x+2=-18
e) 5x-2=7+6
f) 10x +1= -4-5

Valeu!

Answer 1

Olá, boa noite ☺

Resoluções:

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 = -4-5 - 1.
10x= -10.
x=-10/10.
x=-1.

Bons estudos :)