exam Maths Puzzle Numerical Ability

Hi hows everyone today! I need your help please....

Find the slope of any line perpendicular to the line through points (0, 4) and
(-3, -6).

Thanks a million!

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exam Other Question

Jeremy inherits $18,000 and invests part of the money in bonds with an intrest rate of 11%. The remainder of the money is in savinga at a 9% rate. What amount has he invested at each rate if he receives $1,820 in interest for 1 year? -x/3=3 SOLVE

Ive tried multiplying both sides by 3 and then multiplying the top number by 3 and solving and its still not working.. PLEASE let me know what im doing wrong