最新GRE考试数学考点讲解，很多同学对于这个问题有疑问和不解，那么下面就跟着中国教育在线的小编详细了解一下吧。

To solve a linear equation isolate the variable, that is bring the variable to one side with arithmetic operations.

Example:

To solve ax+b=c use the following steps:

1.ax+b=c, subtract b from both sides．

2.ax=c-b, divide both sides by a

3.x=(c-b)/a

Remember:

All linear equations of one variable can be written as ax+b=c and the solution is x=(c-b)/a.

GRE考试数学考点：Substitution

Substitution

Substitution is a method where one or more variables in an expression is replaced by numbers or another set of variables.To evaluate an expression specific numbers are used as substitute. To express in terms of another set of variables, variables are replaced by the new set of variables.

Example:

If x=3, then 2x2+4x+1 can be evaluated by substituting 3 for x.

Replacing all x by 3, we get 2*32+4*3+1=31.

If x=2+y, then x2-3 can be expressed in terms of y by replacing all x by (2+y):(2+y)2-3=y2+4y+1.

Remember:

Do not forget to replace all occurrences of the variable.

After substitution the variable does not appear anywhere in the expression.

以上，就是本文的全部内容分享，希望能给同学们带来参考，如果您还有最新GRE考试数学考点讲解其他方面的疑问，欢迎随时在线咨询客服老师。

>> 雅思 托福 免费课程学习，AI量身规划让英语学习不再困难<<