exam Maths Puzzle Numerical Ability

The model C(x)= 95 + 35x represents cost, in dollars, of renting a car, where x is the number of days car rented. What is the slope for this model and what does this number mean i

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(3x^2)^3(-2x^4)2 Can you please help me solve this problem...instructions...determine which two equations represent perpendicular lines.
(a)y=4/9x-3
(b)y=3x-4/9
(c)y=-1/3x+4/9
(d)y=1/3x-4/9