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Verified answer
Lebar = xpanjang = 2x - 3
keliling = 2(p+l)
18 = 2(2x - 3 + x)
18 = 2(3x-3)
18 = 6x - 6
18+6 = 6x
24 = 6x
24: 6 = x
4 = x
panjang= 2x - 3 = 2(4) - 3 = 8 - 3 = 5 cm
lebar = x = 4 cm
luas = p x l
luas = 5 cm x 4 cm
luas = 20 cm²
l = x
K = 18:2 = 9
9 = 3-2x + x
9 = 3-x
x = 3-9
x = -6
Jadi,
p = 3-2x
= 3 -2x-6
= 3+12
= 15
l = -6
Luas = 15x-6
= -90
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