Two numbers have a sum of 11 and a difference of 10.

X=10.5, Y = .5

Step-by-step explanation:

You set up 2 equations and then solve simultaneously.

X + Y = 11

X - Y  = 10

Add these 2 equations together and you get:

     2X  = 21

So,   X = 10.5 and therefore Y must = .5

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step-by-step explanation:

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step-by-step explanation:

once you graph it hit 2nd (the blue button) and graph

that takes you to a table of coordinates

on the left is x coordinates and on the right is y coordinates and an empty box

(you may have to scroll up/down in order to get ( x, 0)