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What are the characteristics of two parallel straight lines in the function image?
The k of the resolution function on parallel straight lines is equal, for example, y=2x+3 and y=2x- 1 parallel, with equal slopes and never intersecting.

There are three criteria for the parallelism of two straight lines:

(1) Two straight lines are cut by the third straight line. If congruent angles are equal, two straight lines are parallel. Abbreviation: same angle, two straight lines are parallel.

(2) Two straight lines are cut by a third straight line. If the internal dislocation angles are equal, two straight lines are parallel. Abbreviation: internal dislocation angles are equal and two straight lines are parallel.

(3) Two straight lines are cut by a third straight line. If they are complementary to each other, the two straight lines are parallel. Abbreviation: the internal angles on the same side are complementary and the two straight lines are parallel.

Extended data

Using linear function to solve practical problems

General steps of establishing mathematical model and solving practical problems by using linear function

(1) Through experiments, a sufficient number of corresponding values of two variables are obtained through measurement.

(2) Establish an appropriate rectangular coordinate system. In the coordinate system, take the corresponding value as the coordinate point and draw the function image.

(3) Observe the image features and determine the function type.

(4) Using the obtained empirical formula, the required results are further obtained.