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42=4x-2+6x+4
42=10x+2
40=10x
x=4
panjang sisi satu = 2x-1
= 8-1
=7
panjang sisi yang satu lagi
= 3x+2
=12+2
=14
K = 42 cm
42 = 2((3x + 2) + (2x - 1))
21 = (3x + 2) + (2x - 1)
21 = 3x + 2 + 2x - 1
21 = 3x + 2x + 2 - 1
21 = 5x + 1
5x = 21 - 1
5x = 20
x = 4
3x + 2 = 3(4) + 2
= 12 + 2
= 14 cm
2x - 1 = 2(4) - 1
= 8 - 1
= 7 cm
Jadi panjang salah satu sisinya adalah 14 cm atau 7 cm.