Răspuns :
a)5y+21≤36
5y≤36-21
5y≤15
y≤15/5
y≤5
y∈(-α,5]
b)24:y≤4
y≤24:4
y≤6
y∈(-α,6]
c)1≤y:6≤5
1≤y:6
1≤y/6
6≤y
y≥1
y:6≤5
y≤5·6
y≤30
y∈[1,30]
d)7y+4>32
7y>32-4
7y>28
y>28/7
y>4
y∈{4,+α)
5y≤36-21
5y≤15
y≤15/5
y≤5
y∈(-α,5]
b)24:y≤4
y≤24:4
y≤6
y∈(-α,6]
c)1≤y:6≤5
1≤y:6
1≤y/6
6≤y
y≥1
y:6≤5
y≤5·6
y≤30
y∈[1,30]
d)7y+4>32
7y>32-4
7y>28
y>28/7
y>4
y∈{4,+α)