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2 (P + L ) = keliling
P - L = 9.....P = 9 + L
2 ( P + L ) = 42
P + L = 21
9 + L + L = 21
2L = 21-9
2L = 12
L(lebar) = 6
P(Panjang) = 9 + L = 9 + 6 = 15
L=P-9
42=2(P-9) + 2P
42=2P-18+2P
42+18=4P
60=4P
P=15
L=P-9=15-9=6