Question

Calcule o valor de × de modo que
a) 2× + 3 = 15 b ) 7× - 1 = 13 c) 2× - 4 = 3 d) 4× + 2 = - 18 e) 5× - 2 = 7 + 6
F) 10× + 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
x= 14/7
x= 2

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

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

e) 5x-2=7+3
5x= 10+2
x= 12/5
x= 2,4

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

espero ter ajudado