Question

Determine o valor de x nos casos:

Answer 1

d
4x - 25 + x = 90 graus
5x = 90 + 25
5x 115
x = 115/5 = 23  graus  *** resposta

4x - 25 =  4 ( 23 ) - 25 = 92 - 25 = 67 graus **
90 - 67  = 23 graus **

b
35 + x  = 90 graus
x = 90 - 35 
x = 55 graus *** resposta
c
30 + x = 90 
x = 90 - 30
x = 60 graus *** resposta
e
4x + 30 + 2x = 180 graus
6x = 180 - 30
6x = 150
x = 150/6 = 25 graus *** resposta
4x + 30  = 4 ( 25) + 30 = 100 + 30  = 130 graus ***
2x = 2 ( 25 ) = 50 graus ***