Question

помогите пожалуйста номер 69

Answer 1

1) 3.3x-1.6+1.2x<=9.6+3.5-5x

3.3x+1.2x+5x<=9.6+3.5+1.6

9.5x<=14.7

x<=147/95

2) 4.5y+9-3.1+3.1y>5.9+7.2y

4.5y+3.1y-7.2y>5.9-9+3.1

0.4y>0

y>0

3) 0.6a-1.2-0.2>=0.8a+1.6+3.5

0.6a-0.8a>=1.6+3.5+1.2+0.2

-0.2a>=6.5

a<=-32.5

4) -1.4+5.5b-1<-5.5b+1.6

5.5b+5.5b<1.6+1.4+1

11b<4

b<4/11