Graphing
Intersection = solution
The solution is the point where both linear equations are true at once.
Mathematics · Grade 9
Move from one line to two equations that must be true at the same time.
Grade 9 begins with systems of linear equations. Students connect graph intersections, substitution, elimination and real-world constraints to one common idea: find the ordered pair that satisfies both equations.
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Systems of Equations Lab
Read two lines, identify their intersection, use substitution and elimination, and translate simple situations into a system.
Algebra
Substitute or eliminate
Use equivalent algebraic steps to reduce two equations to one unknown.
Applications
Model two constraints
Turn a short context into two equations, then solve the pair together.