tolong dong no 2........

panjang = x
lebar = y

x = 2y-3
keliling = 18
[2x + 2y] = 18
[2 × (2y-3) +2y] = 18
[4y - 6 + 2y] = 18
4y + 2y - 6 = 18
6y - 6 = 18
6y = 18+6
6y = 24
→y = 24/6 = 4 cm
x = 2y-3
x=(2×4)-3
x= 8-3
→x= 5 cm

Jd, luas = p×l = 5×4 = 20 cm²