exam Maths Puzzle Numerical Ability

i need help please
the book says graph
y-1=-1/2(x-3)
thank you mike

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exam Other Question

Mr. Max and Mr. Min start off in the same place and head in opposite directions. Mr. Max is traveling at 60 miles per hour and Mr. Min at 55 miles per hour. How long will it be before the two are 345 miles apart?
solve:

18a^3-54a^2+36a