exam Maths Puzzle Numerical Ability

A line that is perpendicular to this equation would have what slope? Y=0.2X-3

Anyone know the answer? Please help.

Thank you!!!!!

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exam Other Question

This problem is from the "Cracking the New SAT" from Princeton Review, on page 209, from the heading "solving rational equations":((((6x7+9x4)/(2x6+6x2)=54))) Note: the answer is Determine the sixth term of the geometric series a1=-2,r=2