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Tic-Tac-Toe Crossword Puzzle

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Across
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Symbol ≤ includes the number and smaller ones, like x ≤ 3.
4
Shows boundary is included in the solution, like y ≥ 2x + 1.
5
Symbol > means values larger than a number, like x > 3.
7
Symbol < means values smaller than a number, like x < 3.
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Rise over run; shows how steep the line is.
11
An equation with >, <, ≥, or ≤ instead of =.
14
Symbol ≥ includes the number and larger ones, like x ≥ 3.
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Four sections of a graph showing positive/negative x and y.
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Shows all solutions; above for >/≥, below for </≤.
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Compares two values using >, <, ≥, or ≤.
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Plotting points or lines to show solutions.
20
Divides graph into solution regions; dashed for >/<, solid for ≥/≤.
Down
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Two or more inequalities; solution is where shaded areas overlap.
3
A point like (0,0) to decide which side of a line to shade.
6
Where the line crosses the axis, like y-intercept at x = 0.
8
Flat line with slope 0, like y = 3.
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Uses parentheses and brackets, like (2, ∞).
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Describes solutions using brackets, like {x | x > 3}.
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Shows boundary is not included, like y < 2x + 1.
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A number that makes the inequality true, like x = 4 for x > 3.