tolong dijawab pls 3 dan 4 ya pls

3. K= 2p+2l
90 =2(4y+6)+2(3y+4)
90 =8y+12+6y+8
90 = 14y+20
90-20=14y
70 = 14y
70:14 =y
5 =y

Panjang=4y+6
=4(5)+6
=20+6
=26
Lebar=3y+4
=3(5)+4
=15+4=19

Luas=P×L
=26×19
=494 m²