Regarding x=ty+m, there are two ways to find the value of m: one is to substitute two points to solve it; One is to substitute slope and point coordinates.

This is an algebraic expression of a function, which should be analyzed according to the conditions of the topic.

Linear function is a kind of function, and its general form is y=kx+b(k, b is constant, k≠0), where x is independent variable and y is dependent variable. Especially when b=0, y=kx(k is constant, k≠0), and y is called the proportional function of x.