The sum of two numbers is 63, and their difference is 7. find the numbers. use x-(63-x)=7

The two numbers are 28 and 35.

Step-by-step explanation:

x + y = 63  

x - y = 7  

Get one equation with one variable. We can't solve for a variable if we had two variables in one equation.

Add the two equations together.  

2x = 70  

x = 35  

You see, the y's canceled out and we can solve for x.  

Now plug x back in to solve for y.  

35 - y = 7  

-y = -28  

y = 28  

the answer to your question a or b but i am pretty sure it is b. i hope this : )

step-by-step explanation:

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'.