How does variable differ from constant

Difference Between Variable and Constant

Variables are quantities with changing magnitude, hence can assume different values based on the application.

Constants are quantities with unchanging values, and used to represent numbers with significance.

Both constants and variables are represented algebraically by English or Greek letters.

Explanation:

answer: a, c

divide any of the y values by x values and you will always get 3 is the most simple way i can put it for you.