What is a Linear Equation Let us consider a small puzzle: Think of a number and add 7 to get 12. What is the number? We can easily say that the number must be 5. If we use a letter, i.e., (variable) to stand for the unknown number, we can write this puzzle as follows: x + 7 = 12 ...(1) Here, if x = 5, 5 + 7 = 12. So, x = 5 is the unknown number which satisfies the … [Read more...] about What is a Linear Equation