$\"\"$

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The inequality is $\"\"$ .

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Substitute x = 5, y = 7 in $\"\"$ .

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5 + 7 < 11 \ \

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12 < 11

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Since the statement is false. $\"\"$

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Substitute x = $\"\"$ 13, y = 10 in $\"\"$ .

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$\"\"$ 13 + 10 < 11

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$\"\"$ 3 < 11

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Since the statement is true. $\"\"$

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Substitute x = 4, y = 4 in $\"\"$ .

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4 + 4 < 11 \ \

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8 < 11

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Since the statement is true. $\"\"$

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Substitute x = $\"\"$ 6, y = $\"\"$ 2 in $\"\"$ .

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$\"\"$ 6 $\"\"$ 2 < 11 \ \

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$\"\"$ 8 < 11 \ \

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Since the statement is true. $\"\"$

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The solution set is $\"\"$ .