The \( x \)- and \( y \)-intercepts of a line have the same value. If the line passes through \(P=(7,-6)\) and \(Q=(-6,k),\) what is the value of \(k?\)

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Consider the two points \((-1, -1)\) and \((3, 7).\) If a circle passes through these two points, then which of the following cannot also be a point on the circle?

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Consider the line passing through two points \(P=(1, 10)\) and \(Q=(-1, 3) \). If the line also passes through point \(R=(17, a)\), what is the value of \(a\)?

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