What is a term without unknowns

A term with unknowns: for example, 3x, 2Y; a term without unknowns means that there are no such terms
Solving equations
3x2＋xy＋y2＝15
3x2－31xy＋5y2＝－45
Analysis: the two equations of this system do not contain the first-order term of the unknowns. By eliminating the constant term, we can get the equation in the form of AX2 + bxy + Cy2 = 0. When the discriminant b2-4ac is greater than 0, the equation can solve X and y by factoring

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