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Demo class

Period 3 · Algebra I

24 students · Example data for the walkthrough

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DEMO1234

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Your notes

Systems of linear equations can be solved by substitution, elimination, or graphing.
A system has exactly one solution when the two lines intersect, no solution when the lines are parallel (same slope, different intercepts), and infinitely many solutions when the two equations describe the same line.
To solve by substitution: isolate one variable in one equation, then substitute that expression into the other equation.
To solve by elimination: add or subtract the equations to cancel a variable, solve for the remaining one, then back-substitute.