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Distância entre pontos e retas.

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Resolvido Distância entre pontos e retas.

Mensagem por Bergamotinha OwO Dom 01 maio 2022, 14:06

Considere um ponto P equidistante das retas 2x - 3y + 9 = 0 e 3x - 2y + 1 = 0 e pertencente à reta x + 2y - 10 = 0.
Encontre os possíveis pontos P.

Resp.: Sem gabarito.


Boa tarde pessoal!
Fiz da seguinte forma, e consegui achar dois pontos.
-----------
Chamando P de P=(a,b). Fiz distância entre as duas primeiras retas dadas e igualei elas.
Distância entre pontos e retas. Svg+xml;base64,<?xml version='1.0' encoding='UTF-8'?>
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<use x='231.855525' y='62.764633' xlink:href='#g1-98'/>
<use x='239.489294' y='62.764633' xlink:href='#g3-43'/>
<use x='251.250609' y='62.764633' xlink:href='#g3-49'/>
<use x='257.103599' y='62.764633' xlink:href='#g0-106'/>
<rect x='196.071886' y='67.624506' height='.478187' width='64.35258'/>
<use x='210.204861' y='70.493629' xlink:href='#g0-112'/>
<rect x='220.167532' y='70.015442' height='.478187' width='26.123959'/>
<use x='220.167532' y='79.926594' xlink:href='#g3-52'/>
<use x='228.677186' y='79.926594' xlink:href='#g3-43'/>
<use x='240.438501' y='79.926594' xlink:href='#g3-57'/>
</g>
</svg>
Aí com isso, a gente tem que:
1. 2a - 3b + 9 > 0 e 3a - 2b + 1 > 0 ---> a - b = 2 (i)
2. 2a - 3b + 9 < 0 e 3a - 2b + 1 > 0 ---> a + b = 8 (ii)

Como são relações entre a e b distintas, eu consegui achar dois pontos distintos relacionando essas duas equações (i) e (ii) com a terceira equação dada pela questão, chegando em que P = (6,2) ou  P = (2,4)

Está certo fazendo desse modo?
Vlww! cheers


Última edição por Bergamotinha OwO em Dom 01 maio 2022, 21:28, editado 1 vez(es)
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Resolvido Re: Distância entre pontos e retas.

Mensagem por Elcioschin Dom 01 maio 2022, 16:13

Acho que está certo.
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Resolvido Re: Distância entre pontos e retas.

Mensagem por Bergamotinha OwO Dom 01 maio 2022, 21:28

Entendi.
Obrigado pelo feedback Elcio, fiquei com receio de ter feito algo errado.

Até pq, eu só achei esses dois pontos, e n sei se poderíamos ter mais pontos que respeitam essas relações.

Vlww! cheers
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Resolvido Re: Distância entre pontos e retas.

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