Question 350068
X-Y=5 OR X=Y+5
X^2-Y^2=136
(Y+5)^2-Y^2=136
(Y^2+10Y+25)-Y^2=136
10Y=136-25
10Y=111
Y=111/10
Y=11.1 ans.
X=11.1+5=16.1 ANS.
PROOF:
16.1^2-11.1^2=136
259.21-123.21=136
136=136
X+Y=16.1+11.1=27.2 ANSWER.