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First draw a table with two columns and list the x-coordinates in the first column and y-coordinates in the second column.
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x \ | \
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y \ | \
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2 \ | \
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1 \ | \
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2 \ | \
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4 \ | \
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5 \ | \
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1 \ | \
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Draw a coordinate plane and plot the pairs (2, 1), (2, 4) and (5, 1). \ \
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Graph: