建立平面直角坐标系不仅可以对几何图形作精细的数量描述.而且可以对数量关系作直观的图形解析.下面就跟着田老师看一看吧.1.二元一次方程的解与直线上的点一一对应.二元一次方程是只含两个未知数,且含未知数的项的次数都是1的整式方程.如果用x,y表示两个未知数,那么每个二元一次方程都能转化为一般形式ax+by=c,其中a,b,c是已知数,a,b分别叫作x,y的系数,它们都不等于0,c是常数项. The establishment of planar Cartesian coordinate system can not only make detailed description of geometric figures, but also make intuitive graphical analysis of the quantitative relationship.After that, let’s take a look at Tian’s teacher.1 The solution of linear equation and the points on the line Binary one-time equation is an integral equation that contains only two unknowns and the number of unknowns is 1. If two unknowns are represented by x and y, then each binary equation can be transformed into The general form ax + by = c, where a, b, c is a known number, a, b are called x, y coefficients, they are not equal to 0, c is a constant term.