SOLUTION: Please help me out with this maths. The sum of the digits of a two-digit number is 12. The tens digit is the square of its units digit. Find the number.

Question 992167: Please help me out with this maths.
The sum of the digits of a two-digit number is 12. The tens digit is the square of its units digit. Find the number.
Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
x + y = 12, where x is the tens digit and y is the units digit
x = y^2
substitute for x in first equation
y^2 + y - 12 = 0
factor the equation
(y-3)*(y+4) = 0
y = 3 or y = -4
x = 9 or x = 16
*****************************************
we have one solution since we are looking for a two digit number
93
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