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21 = 4x + 1
20 = 4x
5 = x
p = 3x - 2 = 3(5) - 2 = 15 - 2 = 13 cm
yg diketahui keliling= 42cm
rumus keliling = 2p+2l maka:
Keliling=2p+2l
42=2(3x-2) + 2(x+3)
42=(6x-4) + (2x+6)
42=6x - 4 + 2x + 6
42=6x + 2x - 4 + 6
42=8x +2
42-2=8x
40=8x
40/8=x
x=5
kmudian dimasukkan x nya.
p=3x-2 =(3.5)-2= 15-2=13cm
l=x+3= 5+3=8cm