Question

Sebuah taman berbentuk persegi panjang, mempunyai ukuran panjang (5x + 2)m dan lebar (4x + 1)m. Jika keliling taman 62m dan tentukan p dan l

Answer 1

Diketahui:
p = (5x + 1)m
l = (4x + 3)m
k = 62m

Ditanya:
p = ??
l = ??

Jawab:
k = 2(p + l)
62 = 2(5x + 1 + 4x + 3)
62/2 = 9x + 4
31 = 9x + 4
31 - 4 = 9x
27 = 9x
x = 27/9
x = 3

Jadi,
p = 5x + 2
p = 5(3) + 1
p = 15 + 1
p = 16 m

l = 4x + 3
l = 4(3) + 3
l = 12 + 3
l = 15 m

Answer 2

K = 2(p+l)
62 = 2(5x+1+4x+3)
62 = 2(9x+4)
62 = 18x + 8
18x = 62-8
18x = 54
x = 54/18
x = 3

p = 5x + 1 = 5.3 + 1 = 15 + 1 = 16 cm
l = 4x + 3 = 4.3 + 3 = 12 + 3 = 15 cm