book Maths Puzzle Numerical Ability

Find all 2 x 2 matrices whose nullspace is the line 3x-5y=0

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book Other Question

i have a picture of a triangle and the lenght is (3n+1) and the width is (2n-5)
and it says "write the area as a trinomial."
i got
6n^2+13n-5
but it said i was wrong so how do i do these problems?
Please help me solve this equation.

x^2/3-x-1/6=0