Question

preciso da conta!Me ajudem!!
as respostas:
a)130
b)30
c)50
d)120​

Answer 1

A) 70 + 60 + y = 180

y = 180 - 130

y = 50°

x = 180 - 50

x = 130°

B) (3x + 10) + y = 180

y = 180 - (3x + 10)

[180 - (3x + 10)] + (x + 20) + 50 = 180

180 - 3x - 10 + x + 20 + 50 = 180

- 3x + x = 180 - 180 + 10 - 20 - 50

- 2x = - 60

2x = 60

x = 60 / 2

x = 30°

C) x + 20 + x + 60 = 180

x + x = 180 - 60 - 20

2x = 100

x = 100 / 2

x = 50°

D) y + 70 + 50 = 180

y = 180 - 70 - 50

y = 60°

x + y = 180

x + 60 = 180

x = 180 - 60

x = 120°