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p = 3x
l = x
k = 32
Menggunakan substitusi :
k = 2(p +l)
32 = 2(3x + x)
32 = 6x + 2x
32 = 8y
x = 32 : 8
x = 4
Luas persegi panjang :
luas = p x l
= 3(4) x 4
= 12 x 4
= 48m persegi.