exam Maths Puzzle Numerical Ability

find the slope intercept form (y=mx+b) of the equation for the line that satisfy the following:
passes through (5, -9) and is perpendicular to the line whose equation is y=1/7x +4

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exam Other Question

((3)/(x-2))+((2x)/(X^2-4))=((5)/(x+2)) Ace Auto Rental rents cars for $10 per day plus 10 cents per mile driven. Best Rental rents cars for $24 per day with unlimited mileage. How many miles per day can you drive an Ace