book Maths Puzzle Numerical Ability

My questions says write the equation of a line that has a slope of 2/3 and passes through point (6,-3)
my answer is y=4-7=-3
is that right?

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book Other Question

Using the letters A,M,O,S,U. We can form 120 five letter "words". If these "words" are arranged in alphabetical order, then what position the "word"
USAMO occupies? Find all the solutions of the equation. Check your soulutions in the original equation.

x^4-x^3+x-1=0