Question

Bantu jawab yg bisa,1 soal lg..

Answer 1

Keliling = 144
2(p+l) = 144
p+l = 72
Sehingga,
(3x+10)+(x+10) = 72
4x+20 = 72
4x = 72 - 20
4x = 52
x = 52/4
x = 13

Sehingga,
Panjang = 3(13) + 10 = 49 cm
Lebar = (13) + 10 = 23 cm

Answer 2

Persegi panjang
keliling = 2(p + l)
= 2(3x + 10 + x + 10) = 144
= 2(4x + 20) = 144
= 8x + 40 = 144
8x = 104
x = 13
substitusi sehingga panjang = 3x + 10 = 3.13 + 10 = 49 cm
                             lebar = x + 10 = 13 + 10 = 23 cm