Because y 2 = 10 * x+y 1,
X+Y=7②
Substituting ② into ① gives y 2 =10 (7-y)+y.
Y^2=70-9Y
Y=5 or Y=- 14 (irrelevant)
Because y = 5 and x+y = 7, X=2.
Conclusion: Open =2, Heart =5.