解二元一次方程组常用的方法是代入法和加减法。用代入法解题时,要寻求y=ax+b或x=my+n的关系式,再代入求解。但有些题在代入前,如果能利用题目中的数字关系得到y=ax或x=my再代入求解,则更为简便。 The commonly used methods to solve binary equations are the substitution method and addition and subtraction. When using the substitution method to solve a problem, seek the relationship y=ax+b or x=my+n and substitute it into the solution. However, some of the questions before substitution, if you can use the number of relations in the title to get y = ax or x = my and then into the solution, it is more simple.