Question 623145
Sum of two numbers is 55:  x+y = 55<P>
Difference is 9: x-y=9<P>
From the second equation x=9+y (substitute that into the first equation to solve for y).<P>
9+y+y=55<br>
2y=46<br>
y=23.  (Substitute that back into the second equation to find x.)
x=9+y = 23+9 = 32.<P>
23+32 = 55 (Check).
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