exam Maths Puzzle Numerical Ability

xyz-1 power - xz-1 power/yz-1 power -1

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exam Other Question

I invested $18,000. Part of it was invested at 3% annual simple interst and the rest was invested at 4%. I earned $650 in interest for the year. How much did I invest at each rate? Determine which two equations represent perpendicular lines.

A y= 4/7x-3 B y= 3x-4/7 C y=-1/3x+4/7 D y= 1/3x-4/7

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