How to determine which quadrant a straight line passes through

Draw a brief picture

Actually, this is not difficult. If you draw more pictures, you will figure out the rules yourself.

It is easy to memorize it if you memorize it like the one above (of course that is also a method, haha)

Generally when doing questions, you can look like this:

1. First construct a coordinate system in your mind

2. Determine what function this function is

3. See whether the focus of this function and the Y-axis is positive, negative or zero

In this case, it is easy to construct a simple diagram of this function in your mind. The rest is to look at the picture to speak

For example: Y=4X-3

First of all, it is an increasing function, and secondly, it is negative with the Y-axis focus. So just go through the first, third, and fourth quadrants

Supplement: The above applies to straight lines (that is, linear functions), and a similar method can be used when judging curves. But you have to judge whether the opening is upward or downward, the position of the symmetry axis, the positive and negative poles, the positive and negative Y-axis focus, etc. Please elaborate on this later if you encounter problems. Mainly I want to tell you the ideas for solving this kind of problem, draw inferences from analogies, and draw inferences from one instance to another. This is much better than memorizing formulas!

A little personal opinion, I hope it helps you^_^