There are two 2-digit numbers that satisfy the following conditions: (1) each number has the same digits; (2) the sum of the digits in each number is 10; (3) the difference between the two numbers is 54. What are the two numbers?

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Equations and inequalities describe the relationship between two mathematical expressions.

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A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.