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Everybody, save the dying junior high school scum. Mathematical parabola only needs the first small problem.
Let the slope of op be k,? Then the slope of OQ is-1/k.

Their equations are y = kx and y = -x/k respectively.

Use parabola: y? = (kx)？ = x，x = 1/k？ (Let x = 0,? This is the origin)

P( 1/k？ ， 1/k)

y？ = (-x/k)？ = x，x = k？ (Let x = 0,? This is the origin)

Q(k？ ，-k)

PQ equation:

Constant crossing (1, 0)

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