P and Q are two perpendicular underlines, P has the following points (2,1) and (0,0). Q has (2,1) and (0,t) how much is the value of t?

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Osvazur, remember that the product of the slopes of two perpendiculars is always -1. P clearly has slope 1/2. So for Q to be perpendicular to P, its slope must be ___? And to have such slope, t must be ___?