$y$ is a variable, which is a symbol used to represent an unknown or changing quantity in an algebraic expression. It is commonly used in mathematical equations and formulas to denote a value that is not fixed, but rather varies or can be solved for based on the given information or constraints.
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$y$ is often used to represent the dependent variable in a function, where its value is determined by the independent variable(s).
In linear equations, $y$ is typically the vertical axis variable, while $x$ represents the horizontal axis variable.
The relationship between $x$ and $y$ can be expressed using algebraic operations, such as addition, subtraction, multiplication, and division.
Solving for $y$ in an equation involves isolating the $y$ term on one side of the equation, using various algebraic techniques.
The value of $y$ can change based on the values assigned to the other variables in the equation or expression.
Review Questions
Explain the role of $y$ as a variable in a linear equation.
In a linear equation, $y$ represents the dependent variable, meaning its value is determined by the value of the independent variable, $x$. The relationship between $x$ and $y$ is expressed using a linear function, where $y$ can be isolated and solved for by applying various algebraic operations to isolate the $y$ term on one side of the equation.
Describe how the value of $y$ can change based on the values assigned to other variables in an equation.
The value of $y$ is not fixed, but rather varies based on the values assigned to the other variables in the equation or expression. As the values of the independent variables change, the corresponding value of the dependent variable, $y$, will also change accordingly. This relationship between the variables is the foundation of functional thinking and can be used to model and analyze various real-world phenomena.
Analyze how the use of $y$ as a variable can be applied to solve for unknown quantities in mathematical problems.
By representing an unknown or changing quantity with the variable $y$, mathematicians can set up equations and expressions that can be solved to determine the value of $y$. This process of isolating and solving for $y$ involves applying various algebraic techniques, such as combining like terms, factoring, and using inverse operations. The ability to solve for $y$ is essential in many mathematical applications, as it allows for the determination of unknown values and the exploration of relationships between different quantities.
A relationship between two or more variables, where the value of one variable (the dependent variable) depends on the value of the other variable(s) (the independent variable(s)).