Question

why do we use a variable in an equation.​

Answer 1

Answer:

Step-by-step explanation:

Variables ' are used to represent certain unknown values. x, y, z and many other letters of English alphabet , also Greek alphabet is used . These represent the unknown terms/values . 'Algebra' , a broad part of mathematics , is where variables are used mostly to represent certain terms in an equation .

Answer 2

Variables can be used anywhere an answer is required but not known. It can be used to find unknown numbers. It can be used to graph equations where you have two variables. To graph, you would choose various numbers to put into one of the variables and calculate the other.