I think its he didnt eliminate the same variables
Answer:
square root of 166, 13, 14
Step-by-step explanation:

Putting the value of Y = 15

So, X = 200
You have the right answer 6p+2
+6 ; 45,51
+ evens; 40,52
X -2; -64, 128
+ reducing squares 63+1/4, 63 +13/36