a washer and a dryer cost $929 combined. The washer costs $79 more than the dryer what is the cost of the dryer

The dryer cost $804

Step-by-step explanation:

y = x + 79

x = x

x + x + 79 = 929

          -79    -79

2x = 850

850/2 = 425

x = 425

y = 425 + 79

y = 804

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'.