Plugging 10 for k in the expression gives us
We simplify this expression to
251 is your answer
Y+x=98
y-x=22
I'm going to use elimination.
y+x=98
y-x=22
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2y+0x=120 SIMPLIFY 2y=120 SIMPLIFY y=60.
Substitute that into either equation and you get y=60 and x=38
Have a nice day! :)