For example, y=x-2, the function image is easy to draw and the slope is a straight line. If the function image moves two units along the negative direction of the X axis, that is, the whole function image moves two units to the left, then the obtained image is y=(x+2)-2, that is, y=x, which is called "left addition"; "Subtract to the right" means that if the function image is moved to the right by 2 units, then y=(x-2)-2, that is, y=x-4.

Or the function of y=x-2, moving two units in the positive direction of the y axis, that is, moving the function image up by two units, then the function becomes y=(x-2)+2, which is the so-called "addition". Similarly, when subtraction occurs, the resolution function is y=(x-2)-2, that is, y=.

Extended data:

Scope of application of left plus right minus:

One-dimensional linear equation: An integral equation with only one unknown number and one unknown number is called one-dimensional linear equation. The usual form is ax+b=0(a, b are constants, a≠0).

Binary linear equation: A binary linear integral equation with degree 1 is called a binary linear equation. Two common * * * solutions of binary linear equations are called solutions of binary linear equations.

Quadratic equation of one variable: an integral equation of unknown number with the highest degree of 2. Such an equation is called an unary quadratic equation. The transformation from a linear equation to a quadratic equation is a qualitative change. Usually, quadratic equation is much more complicated in concept and solution than linear equation.

References:

Baidu Encyclopedia: Equation