Question

¿Me ayudan a resolverlos?

Answer 1

Respuesta:

a)12x+5x+9x=180°

26x=180°

x=180°/26=90°/13

b)5x+8+120=180

5x=180-120-8

5x=52/5=10.4

c)120+2x+8y=180.......a

40+3x+y=180...........b

3a-2b

360+6x+24y=540

80+6x+2y=360

______________( - )

280+22y=180

22y=-100

y=-100/22

y= -50/11

40+3x-50/11=180

440+3x-50=1980

3x=1590

x=530

d)2x+y+4x+y+8x+y=180......a

6x+2y+(8x+y)=180.......a

8x+y+5x+2y=180......b

a-b

x=0

8x+y+5x+2y=180......b

0+y+0+2y=180

3y=180

y=60

e) x+y+150=180

(x+y)+90=2x-8y_______90=x-9y

______________(-)

150-90=180-2x+8y

60=180-2x+8y

2x-8y=180-60

2x-8y=120

x-4y=60_____90=x-9y

-4y+9y=60-90

5y=-30

y=-6

x=60-24

x=36

f) 80=x+45

x=80-45

x=35