Grade 12 Vectors - Point of intersection between a line and sphere (ch 8.3)

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[@alextykoun9874]

You can make it easier. Observe, that x=10+2s =2(5+s)=2y. So, x²=4y². => 5y²+4=9, y²=1, y = ±1. Thus, s = - 4 or - 6.😉

[@astryl100]

Nice catch