Question

calcule o valor de x nas proporções
a)2x/3=8/9
b)x-2/12=8/9 c)3/2=x+3/x-1

Answer 1

a)18x=24          x=24/18        x=4/3

b)9(x-2)=96         9x-18=96        9x=96+18        9x=114       x=114/9

c)2(x+3)=3(x-1)         2x+6=3x-3            2x-3x=-3-6           -x=-9(-1)     x=9

Answer 2

a) 2x = 8 ==> 18x = 24 ==> x = 24/18
     3     9

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b)  x-2 = 8 ==> 9(x - 2 ) = 8.12 ==> 9x - 18 = 96 ==> 9x = 96+18
      12    9

9x = 96+18 ==> 9x = 114 ==> x = 114/9
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c)  3 = x+3 ==> 3(x-1) = 2(x+3) ==> 3x - 3 = 2x + 6
     2    x-1

3x - 2x = 6 + 3 ==> x = 9