Quandaries
and Queries 

My name is Amy My problem is: Write the equation of the line that contains the point (4,6) and is perpendicular to the line y=5x+100. 

Hi Amy, I would first draw a diagram, even if it is only a mental diagram in my head.
The fact you need is that if two lines are perpendicular then the product of their slopes is 1. The slope of the line y = 5x + 100 is 5 and thus the slope of a perpendicular line is ^{1}/_{5}. Can you complete it now? Penny 

