Question

determine o valor do x nas proporções a seguir
b) 9
--- = (x+2)
4 ------
(x-3)


c) x+5 10
____ = ___
x 8

Answer 1

  9      =    x + 2
------        -----------
  4              x - 3

9.(x - 3) = 4.(x + 2)
9x - 27 = 4x + 8
9x - 4x = 8 + 27
5x = 35
x = 35/5
x = 7

**************************
c)

x + 5          10
--------   =  ------- 
   x               8

8(x + 5) = 10.x
8x + 40 = 10x
40 = 10x - 8x
40 = 2x
2x = 40
x = 40/2
x = 20