CliffsQuickReview Algebra I
Chapter One
EQUATIONS WITH TWO
VARIABLES
Chapter Check-In
Solving systems of equations
Addition/Subtraction method
Substitution method
Graphing method
If you have two equations with the same two unknowns in each, you can
solve for both unknowns.
Solving Systems of Equations
(Simultaneous Equations)
There are three common methods for solving: addition/subtraction, substitution,
and graphing.
Addition/subtraction method
To use the addition/subtraction method,
1. Multiply one or both equations by some number to make the
number in front of one of the letters (unknowns) the same in
each equation.
2. Add or subtract the two equations to eliminate one letter.
3. Solve for the other unknown.
4. Insert the value of the first unknown in one of the original
equations to solve for the second unknown.
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