What is the implication number?

The traditional definition of function: there are two variables X and Y. if for every certain value of X in a certain range, y has a unique value corresponding to it, then y is called the function of X, and X is called the independent variable. We call the set of values of independent variable x as the definition field of function, and the value of Y corresponding to X as the function value

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4. For junior high school mathematics how to learn the number of good?
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6. The second grade of junior high school Given the linear function y = KX + B, if y increases with the increase of X, which three image limits does the function image pass through? The correct answer is one two three quadrants. Why is there no one three four quadrants? Y increases with the increase of X. isn't the image rising from left to right? Why is there only one two three quadrants?
7. Given that the shadow area is 50 square centimeters, find the area of triangle ABC
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20. How to prove that an is equal difference function and equal ratio function