Common Core Standards
To solve systems of equations by graphing, just simplify the equations to be in slope intercept form (y = mx + b), and then graph them. Finally, find the intersection point... and you have your variable values. Easy... right?
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Solving Systems of Equations by Graphing 
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Graphing Square Root Functions 
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Graphing Points 
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Graphing Linear Inequalities on a Coordinate Plane 
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Graphing and Visualizing Limits