Question

Resolva as seguintes proporções:
A) 5x+3/10 = -21/30
B) 0,9/x = -18/27
C) 7x+5/4 = 2x/ ¾

Answer 1

A) 5x+3/10 = - 21/30

5x+3/10 = - 7/10

5x + 3 = -7

5x = -7 - 3

5x = -10

x = - 10/5

x = -2

B) 0,9/x = - 18/27

9/10/x = - 2/3

9/10x = - 2/3

27 = -20x

x = - 27/20 = -1,35

C) 7x+5/4 = 2x/3/4

7x+5/4 = 8x/3

3(7x + 5) = 32x

21x + 15 = 32x

21x + 32x = -15

-11x = -15 (.-1)

11x = 15

x = 15/11 = 1,36