exam Maths Puzzle Numerical Ability

Could you please help me understand and solve this equation?
Write an equation of the line containing the given points and perpendicular to the given line express answer y=mx+b
(8,9) 4x+y=9
The equation of the line is y=

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exam Other Question
If you pay 32% of your income in taxes and your income after taxes is $23,256, what is your gross (before taxes) income?

I tried 23,256 x 32% = 7,441.92
am I going in the right direction? My answer does not look correct I need help on this problem. I am not sure how to do it.

Find mca, m<b, and m<c.


___________a_____b________________


__________________c______________