Jawabanmu

2014-08-17T23:59:27+07:00
1. y-3/6=21/14
y=21/14 + 3/6 *pecahannya disederhanakan
y=3/2 + 1/2
y=4/2
y=2

2. \frac{15}{y+4}= \frac{20}{16}
y+4=15. \frac{16}{20}
y+4=12
y=8