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In this unit, we learn how to write systems of equations, solve those systems, and interpret what those solutions mean in a real-world context. **Unit guides are here!** Power up your classroom with engaging strategies, tools, and activities from Khan Academy’s learning experts.
How can you use clues from two algebraic expressions to figure out the value of a variable? In this unit, you'll learn how to solve a system of equations or inequalities in two variables by elimination, substitution, and graphing.
A "system of equations" is when we're dealing with more than one equation at the same time. These tutorials show you how to set up and solve systems of equations.
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Systems of equations with elimination: TV & DVD. Systems of equations with elimination: apples and oranges. Systems of equations with substitution: coins. Systems of equations with elimination: coffee and croissants. Systems of equations: FAQ.
The Algebra 1 course, often taught in the 9th grade, covers Linear equations, inequalities, functions, and graphs; Systems of equations and inequalities; Extension of the concept of a function; Exponential models; and Quadratic equations, functions, and graphs.
Let's explore some different ways to solve equations and inequalities. We'll also see what it takes for an equation to have no solution, or infinite solutions. Unit guides are here!
Solve systems of equations where one of the equations is solved for one of the variables.
In this unit, we learn how to write systems of equations, solve those systems, and interpret what those solutions mean in a real-world contexts. **Unit guides are here!** Power up your classroom with engaging strategies, tools, and activities from Khan Academy’s learning experts.
When we perform operations on a system of equations, some operations produce an equivalent system, while others don't necessarily produce an equivalent system. When we're solving a system of equations, we need to use operations that guarantee equivalence.