exam Maths Puzzle Numerical Ability

I need help solving a math problem. The only thing is, is that the teacher wanted us to us the augmented way. This is in chapter 4-8 in my prentice hall text book.
the problem is:

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exam Other Question

Hi Can I have some help finding an equation of the line through (9, 6) and perpendicular to the line passing through (10, 4) and (-9, 0)? Thanks. y=10e-[-ln(1/2)/21.77](19)