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一次方程组是初中阶段的重点知识之一,它的基本解法是：代入消元法和加减消元法．在加减消元法中,往往是通过两式相加(或减),达到消元的目的．在实际解题时,两式相加(减)一定要消元吗?请看下列例子．
The primary equation is one of the key knowledge in the junior high school. Its basic solution is: substitution into elimination method and addition and subtraction elimination method. In the addition and subtraction elimination method, it is often achieved by adding (or subtracting) two formulas to achieve the purpose of elimination. In the actual problem solving, do the two equations add (subtract) must be eliminated? Please see the following examples.