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参考・概略です

傾きを細かく求めていくと
 以下のような感じになります

 P(x₁,y₁),A(0,5) なので,

  {(5)-(y₁)}/{(0)-(x₁)}

 ={5-y₁}/{-x₁}

 ={-5+y₁}/{x₁}

 ={y₁-5}/{x₁}

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