The answer to your question is -20 i hope this helps!
If the line is perpendicular to x = 4, then that means the answer should be y = some number
and since we have the equation going through point (5,7), we look at the y-value since our equation is y=some number and replace the y-value into that equation.
So the correct answer is C. y = 7
Hope that helps :)
The answer is 336 because since combinations are a way to calculate the total calculations so the answer is 336.
