Step 1 Are your points on the same vertical line?
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How would you know this?
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The x values are the same
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If YES is the answer to this question, then the equation of your line is x = repeating x value
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Step 2 Are your points on the same horizontal line?
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How would you know this?
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The y values are the same
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SAME x values example
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If YES is the answer to this question, then the equation of your line is y = repeating y value
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SAME y values example
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Step 3: Are your points free of any repeating x or repeating y values?
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If YES is the answer to this question, then you have a diagonal line
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Diagonal lines
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Labeling the slope right triangle
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Helpful link to Geogebra File
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Exemples