Linear equationsLinear equations are all equations that have the following form: y = ax + b x is called independent variable y is called dependent variable a and b are called constant For examples, y = 2x + 5 with a = 2 and b = 5 y = 3x + 2 with a = 3 and b = 2 y = 4x +  1 with a = 4 and b = 1 Real life examples, or word problems on linear equations are numerous. Consider the following two examples: Example #1: I am thinking of a number. If I add 2 to that number, I will get 5. What is the number? Although it may be fairly easy to guess that the number is 3, you can model the situation above with an equation Let x be the number in my mind. Add 2 to x to get 5 Adding 2 to x to get 5 means that whatever x is, when I add 2 to x, it has to equal to 5 The equation is 2 + x = 5 Example #2 : Soon or later, all of us use the service of a taxi driver Taxi drivers usually charge a an initial fixed fee as part of using their services. Then, for each mileage, they charge a certain amount Say for instance, the initial fee is 4 dollars and each mileage cost 2 dollars The total cost can be modeled with an equation that is linear. Let y be the total cost Let N be number of mileage Total cost = 4 + cost for N miles Notice that cost for N miles = N×2 Therefore, y = 4 + N×2 Say for instance, a taxi driver takes you to a distance of 20 miles, how much money do you have to pay using y = 4 + N×2 ? When N = 20, Y = 4 + 20×2 = 4 + 40 = 44 dollars Now, let's ask the question the other way around! If you pay 60 dollars, how far did the taxi driver took you? This time y = 60 Replacing 60 into the equation gives you the following equation: 60 = 4 + N×2 It is not obvious to see that N = 28. That is why it is important to learn to solve linear equations! 




 Homepage  Integers
Comparing integers
 Adding integers
 Subtracting integers
 Multiplying integers
Division of integers
 Variables in algebra
 Linear equations
 Solving equations using addition
 Solving equations using subtraction
 Solving multiplication equations
 Solving twostep equations
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