math
posted by Carol .
The graph of the line through (2,3) that is perpendicular to the line with equation y= 1 also goes through which point?
(1,4)
(2,4)
(2,3)

Think about the line y=1. What does it look like?
It's all the points where y is 1: (0, 1), (2, 1), (2000, 1)... so it's a line straight up and down. Any line perpendicular to is must be straight across, so it must be of the form
x = something, where all the values of x are the same.
You know that the perpendicular passes through (2,3). What is the x value of that point?
So which of your choices has the same xvalue?