book Maths Puzzle Numerical Ability

what is the gradient of a line perpendicular to y=3x

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book Other Question

Let x1<...< xm . For I = 1,�,m, define linear operators
Ti : Pn --> R1
By Tip = p(xi). If m<=n, show that (T1,...Tm) is linearly independent. What happens if m>n? Explain How do you change 28/9 to a mixed or whole number.