exam Maths Puzzle Numerical Ability

The question on my homework is Find the perpendicular line thru the coordinate given

How do you graph 3x+4y=12 if the coordinate given to you is(5,-2) and the line has to be perpindicular?

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exam Other Question

I have been trying to figure out how this is set up but I am confused. So far I not sure if this is the right set up: n-4=96

Word Problem:
The product of a number and 4 less than the number is 96. Find the number. the length of a rectangle is 4 more than twice the width. the perimeter is 28cm. What are the measures