Question

como resolver? (foto)

Answer 1

A) x + 15° = 2x - 6°
x - 2x = -6° - 15°
-x = -21° .(-1)
x = 21°

B) 3x - 20° = 2x + 10°
3x - 2x = 20° + 10°
x = 30°

C) 4x + 5x = 180°
9x = 180°
x = 180° / 9
x = 20°

D) 2x + 5x - 30° = 180°
7x = 180° + 30°
7x = 210°
x = 210° / 7
x = 30°

Answer 2

a)2x-6 +x+15=90
3x=96-15
3x=81
x=27

b)3x-20+2x+10=90
juntando parcelas iguais
3x+2x=90-10+20
5x=100
x=20


C)4x+5x=180
9x=180
x=180/9
x=20.


d)2x+5x-30=180
7x=180+30
7x+210
x=210/7
x=30