Question

calcule o valor de x nas proporçoes x-1/4=x/6.
b) x+2/3-x=4/1
c) x-1/6=9/12
d) 5-x/x+1=6/2

Answer 1

a) 4x= 6*(x-1)
4x=6x-6
6x-4x-6=0
2x=6
x=6/2
x=3

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

x+2=12-4x
4x+x=12-2
5x=10
x=10/5
x=2

c) 54=(x-1)12
54=12x-12
54+12=12x
66=12x
x=66/12
x=11/2

d) 10-2x=6x+6

10-6=6x+2x
4=8x

x=4/8
x=1/2

Answer 2

Bom dia Naty

b)

(x + 2)/3 - x = 4

x + 2 - 3x = 12

2x = 2 - 12
2x = -10

x = -5

c)

(x - 1)/6 = 9/12 
12*(x - 1) = 6*9 
12x - 12 = 54 
12x = 54 + 12 = 66
x = 66/12

x = 11/2 

d)

(5 - x)/(x + 1) = 6/2
2*(5 - x) = 6*(x + 1)
10 - 2x = 6x + 6
8x = 10 - 6 = 4
x = 4/8 = 1/2 

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