How to calculate part b and c of this question? ?

For part a, while you didn't ask about this particular part, the equation you should have found is .\

For part b, we are given that ∠M = 90°. Recall that perpendicular lines join at a right angle by definition, and that the slope of a perpendicular line is the negative reciprocal slope
.
Using the slope from part a, , so .
We can write the equation of the line through M and N as .
We are trying to fine the value p for which x is 16, so we substitute 16 into the equation we just found and solve for y (which is p).



For part c, .

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