Question

Ayudaaaaa !!!!!
Ayudaaaaa !!!!!​

Answer 1

Respuesta:

1. a=76
2. b=-620/171 ó -3 107/171
3. a=13.6
4. x=7/55
5. y=60/17
6. y=-20

paso a paso:

6(a+5)+10=7(a-4)-8

6a+30+10=7a-28-8

30+10+28+8=7a-6a

76=a

4.5b+70.4=8.4-12.6b

4.5b+12.6b=8.4-70.4

17.1b=-62

b=-62/17.1

12a+9(a-2)=8(2a)+50

12a+9a-18=16a+50

12a+9a-16a=50+18

5a=68

a=68/5

a=13.6

2.2x-0.12=8.8x+0.72

-0.12-0.72=8.8x-2.2x

-0.84=6.6x

0.84/6.6=x

7/55=x

3/6y-2/5y=6/9y-2

1/2y-2/5y=2/3y-2

1/2y-2/5y-2/3y=2

15-12-20/30y=2

-17/30y=2

y=2÷17/30

y=60/17

15y+4(y-5)=7(3y)+20

15y+4y-20=21y+20

15y+4y-21y=20+20

-2y=40

y=40/-2

y=-20