1) 2,5/7y = 5/42
2,5/5 = 7y/42
0,5=7y/42
21=7y
y=3
2)9,3/15=3,1/4y
9,3/3,1=15/4y
4y=15/-3
4y=-5
y=-1 4/5
1) 2,5/7y = 5/42
2,5/5 = 7y/42
0,5=7y/42
21=7y
y=3
2)9,3/15=3,1/4y
9,3/3,1=15/4y
4y=15/-3
4y=-5
y=-1 4/5