![]() Variables are often represented by an alphabet like a, b, c, or x, y, z. ![]() But 3x and 5y are not constants because the variable x and y can change their value.Ī value that keeps on changing is said to be variable. Constants are represented by numbers.ģx + 5y = 7, where 7 is the constant we know its face value is 7 and it cannot be changed. Constant has a fixed value and its value cannot be changed by any variable. So let us see the definition of constant and variable.Īs the name implies, the constant is a value that remains constant ever. Here the height of a kid is variable because it will keep on changing over the period of time but the dress of a kid will remain the same forever so it is a constant. The height of a kid and the dress of a kid. We must be quite familiar with what is the difference between constant and variable. These terms are used at every step in Algebra. Represents varying values.When we learn the term equation we have to first understand the terms of constant and variable. Gives you a general idea of just what a variable is. Say star represents the number of tips in an hour. It as 10 plus x, where x is your tips per hour. Have to use a letter, although in traditional algebra, If t is equal to 5? Well, then, this wouldĮvaluate to 10 plus 5, which is equal to 15. Would say, OK, what happens when t is equal to 30? Well, then, we have a situation. Just written 10 plus t, where t represents the tips Instead of writing tips, maybe we could have ![]() Words typically used in algebra as variables. As you see, this entireĮxpression- the 10 plus tips- it changed depending on what the Instead of writing tips here, I'll write 30 because that's Might make in that hour- we can go back to thisĮxpression right over here- it's going to be 10 plus. Might be lunchtime, get a lot of tips, people might I might make in an hour can change dramaticallyįrom hour to hour. That the number of tips or the amount of tips Working in a restaurant, and I'm making $10 per hour. Contrarily to Viète's convention, Descartes' is still commonly in use. In 1637, René Descartes "invented the convention of representing unknowns in equations by x, y, and z, and knowns by a, b, and c". ![]() François Viète's convention was to use consonants for known values and vowels for unknowns. How much more time pass, the distance you traveled increase in a same speed.įrançois Viète introduced at the end of 16th century the idea of representing known and unknown numbers by letters, nowadays called variables, and of computing with them as if they were numbers, in order to obtain, at the end, the result by a simple replacement. The speed is a exemple: if you have a constant speed, then the distance is the dependent variable and the time is the independent variable. In a function, for exemple, we have two variables: one is independent and other is dependent for the first one which means that when you change intentionally the independent then the dependent changes too. Thats why we use them: to work when we dont know the answer yet. Now, you have 2 variables and several responses. I have a statement and x is a variable because it can be any real number, but in truth it is a question: what numbers i can put in place the x and the results will be true? The answer how you know is 2. Therefore, a variable works how a question. But, if you put a variable in a statement, so the proposition can be false and true either for different values. In Math, when you make a statement, then it can be false or true. Now, a variable can be anything, it depends of the statement. For exemple: give a tip for a good waiter. In this case, tips are the sum of money given to someone as a reward for a service.
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