Solving a System with Substitution 3 (Randomized Interactive Practice)

① This example demonstrates solving a system of two linear equations using the substitution method, with randomly generated coefficients and interactive answer checking. ② The core mathematical concept is the substitution method for linear systems, including algebraic simplification, variable replacement, and verifying solutions. ③ Construction highlights: from the summary, RandomElement and Random commands generate random coefficients and constants; Simplify simplifies expressions; Textfield and InputBox create input fields for user answers; button triggers validation; list1, list2 store random numbers; f and g represent the two linear equations; A, v, h likely display results or hints. ④ Suitable for middle school students (grades 7-8) learning systems of linear equations, and useful for teachers as a dynamic demonstration or for students' self-paced practice with randomized problems and immediate feedback.