Two pairs of statements about Jeff's housing expenditures are given below. How can both pairs of statements be true?
When did Jeff spend more on housing? Be prepared to discuss your answers in class.
Pair 1
Pair 2
In 1990, Jeff spent $600 per month on housing.
In 1990, Jeff spent 20% of his income on housing.
In 2010, Jeff spent $1,200 per month on housing
In 2010, Jeff spent 10% of his income on housing.

for the friend request.

when a figure, such as triangle (xyz) is reflected over the line y = x to create x'y'z' the x-coordinates and y-coordinates of the original image (pre-image) will be reversed for the image. (e.g., (x, y) > (y, x)) this means that the pre-image position of the x- and y-coordinates switch places which in turn provides a mirror like image of the original xyz.  

i notice that when i draw a line segment from x to x', that the points are parallel from each other -- they are exactly across from each other and do not intersect with any other points.  

yes, think i would see the same characteristic if you drew the line segment connecting y with the reflecting line and then y' with the reflecting line because of the essence of reflections. because it is a mirror image, each point was effected the same way which leads me to conclude that they same would apply to y and y'.