encuentra p,de modo que las rectas px-5y+5=0 y 2x-5y-20=0 sean paralelas
px-5y+5=0
-5y=-px-5
y=px/5+1
2x-5y-20=0
-5y=-2x+20
y=2x/5+20
2/5=p/5
p=2
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px-5y+5=0
-5y=-px-5
y=px/5+1
2x-5y-20=0
-5y=-2x+20
y=2x/5+20
2/5=p/5
p=2