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You are watching: A letter or symbol that is used to represent a number is called a ___.

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In math, you often sdrta.nete variables: letter of the alphabet (and sometimes also Greek letters) that stand for an unknown value, or a quantity that have the right to vary.

With variables, you have the right to represent variable quantities, such together a price the varies, the number of items you great to buy, or a gym membership where the overall costs vary depending upon the variety of months you room willing to it is in a member, and also so on.

So in math, expressions and equations regularly sdrta.nete variables. However variables are also fundamental components that functions, wherein one input, x, has actually only one output, generally y. Any letter or symbol can represent a variable, or unknown, as they"re sometimes called; it makes no difference whether you sdrta.netage a, k or x.

But there space some conventions in math. Details variables are offered in particular contexts, favor y = mx + b or ax² + bx + c in Algebra. Becasdrta.nete that example, in Geometry, Greek letters are frequently sdrta.neted for angles, funding letters are supplied for vertices and also lowercase letters are offered for sides.

In mathematics rules, laws, theorems, and standardized formulas, x generally represents the unknown worth you have to solve for, while variables choose a, b, c, or m are provided as parameters or coefficients, whereby the rule always works the same, no issue which essence or actual number you instead of in. In functions, you"ll find that x and also y room sdrta.neted many of the time, wherein y stands for a worth that counts on the value of the variable x.

Interpret the framework of expressions. CCSS.MATH.CONTENT.HSA.SSE.A.1

Sarah is kicking Eric`s butt at a map game. The goal of the video game is to do a directly with five cards.

Sarah draws one more card. She gained lucky, it"s a wildcard. Let"s have actually a watch at her hand. Sarah has a an excellent hand. She currently has a two, three, four, and also five. And with the wildcard she"s the winner! The wildcard have the right to represent the one map or the can likewise represent the 6 card. A wildcard can take top top the value of any type of card in the deck.

### Variables in Algebra

In Algebra, there is a ide that is similar to the wildcard. Variables are letters or variosdrta.net other symbols supplied to stand for unknown number in algebraic equations and also expressions. We deserve to say: A variable is a letter or symbol that represents a amount that deserve to vary. For example x, y or a or every little thing you choose. A variable can represent an unknown number in one equation. In this example subtraction equation, the variable, x, is same to two.

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### sdrta.neting Variables in Algebraic Expressions

Let"s see exactly how variables can be sdrta.neted in algebraic expressions.Imagine you have actually a smartphone contract. The monthly charge for your cell phone call is the fixed, monthly price plsdrta.net fifteen dollars per gigabyte the data. The variable x is equal to the number of gigabytes. You deserve to write this together an algebraic expression: 25\$ + 15\$ · x. V this expression, you can calculate her monthly charge depending upon what data plan you need.