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UNIT
4
4.4: Graph to Solve Story Problems
9.0a:Students solve a system of two linear equations in two variables algebraically and are able to interpret the answer graphically. Students are able to solve a system of two linear inequalities in two variables and to sketch the solution sets.
8.0:Students understand the concepts of parallel lines and perpendicular lines and how those slopes are related. Students are able to find the equation of a line perpendicular to a given line that passes through a given point.

## Today's Objective

Students will be able to use a graph to find a solution that will work in each of two linear equations.

# Key Vocabulary

Solve
Variable
Linear
Substitution
Sketch
Solution
Intersection
Coordinates
Guess-and-Check
System of Equations
System of Inequalities
Graphical Interpretation
Parallel
Perpendicular
Slope
Same Slope
Opposite-Reciprocal Slope