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Panjang = 3x+1
lebar = 8 cm
L ≤ 128 cm
maka :
a. pertidaksamaan dlm x :
L ≥ p x l
128 ≥(3x+1) x 8
128 ≥ 24x + 8
b. penyelesaaian :
128 ≥ 24x + 8
128-8 ≥24x
x ≤ 120/24
x ≤ 5 cm