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l= (2x+3)
k= 2(p+l)
68 = 2((5x-4)+(2x+3)
68= 2(7x-1)
68= 14x -2
14x= 70
x = 5
panjang= 5×5-4= 21
lebar = 2×5+3 = 13
luas = panjang × lebar = 21 × 13 = 273 cm²
l: (2x+3)
keliling : 64
keliling : 2p + 2l
68 : 2(5x-4) + 2(2x+3)
68 : 10x-8+4x+6
68 : 14x - 2
68+2 : 14x
70 : 14x
70/14 : x
5 : x
panjang : (5x-4) : 5.5-4 : 25-4 : 21
lebar : (2x+3) : 2.5+3 : 10+3 : 13
luas : p x l
: 21 x 13
: 273 (c)