It isn't clear what the equation is; as usual here in Wiki Answers, some symbols (such as the equal sign) get lost. In any case, the idea is to replace "x" with the first number, "y" with the second number, and do the calculations.
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Yes, 0, 2 is a solution to y=-x+2 because 0=-2+2 which can be rewritten as 2-2=0.
Yes, because if you sub in for x and y, you get 4-0=4 and this is true
y = 0x = y + 2plug 0 in for yx = 0 + 2x = 2
Probably yes. But it is difficult to be sure because the browser used for posting question is rubbish and strips out most mathematical symbols. Consequently, we cannot see the equation and have to guess where the equality symbol might be.
Yes if x=2 and y=2, then x=y