The value of the variable in an equation which satisfies the equation is called a solution to the equation. Here we will learn to solve an equation using substitution.
Understand how variables can be used to denote patterns and equations, thus making our lives simpler in complex scenarios.
A variable is a number whose value is not fixed; e.g. n is a variable and it can take any value 1, 2, 3, 4, …
Algebra is the language through which we describe patterns in mathematics. It involves usage of letters with numbers to depict problems. In this topic chapter we will learn about Matchstick patters, we will introduce the idea of variables, and we will understand where these variables can be used. A variable is depicted as a letter which can take any value. We will also learn to write linear expressions and ways to solve them.
Expression like (4x + 5), which contains the variable x, cannot be evaluated. Only if x is given some value, an expression like (4x + 5) can be evaluated. In this topic we will learn how to evaluate exponential equations, we will write expressions variables and learn how to solve them when the value of the variable is specified.
In this topic we will learn to evaluate and interpret linear expression using examples from real world problems.
All video content by Khan Academy is under their license: CC by NC SA
Website created using Khan Academy Static Downloader