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  • Plotting inequalities on a number line (video) | Khan Academy
    A closed circle is for when the number is equal or less than the number provided An open circle is for when the number is greater than the number provided
  • Graphing inequalities review (article) | Khan Academy
    An inequality like x> 4 tells us that x can be any value greater than 4 We can show this on a number line by putting an open circle on 4 and shading the numbers that are greater than 4
  • Plotting inequalities (video) | Khan Academy
    They are different "≤" means "less than or equal to" "≥" means "greater than or equal to" For these, we put a solid dot on that starting value to indicate it is included in the solution set Then, we put an arrow to the right for greater than, or to the left for less than "<" means "less than" ">" means "greater than" For these, we put an open dot on the starting value to indicate that
  • Plotting an inequality example (video) | Khan Academy
    Drawing a number line helps visualize 'x is less than 4' We mark 4 with a circle, not a dot, because 4 isn't included Then, we color the line below 4, showing all values less than 4 Easy peasy, lemon squeezy
  • Plotting an inequality example (video) | Khan Academy
    Now if your hand is closed around an item you can contain it within your hand For an inequality example, let's use 2 ≥ x the circle is closed because 2 is contained and agrees with the inequality given 2 is a solution because 2 is greater than or EQUAL TO x
  • Worked example: graphing piecewise functions - Khan Academy
    If it's "greater than or equal to" or "less than or equal to", the line should have a closed circle If it's "greater than" or "less than" the line should have an open circle
  • Introduction to piecewise functions - Khan Academy
    And x starts off with -1 less than x, because you have an open circle right over here and that's good because X equals -1 is defined up here, all the way to x is less than or equal to 9
  • Intervals and interval notation (video) | Khan Academy
    If you go back and watch Sal show the notation of the first interval (blue writing), both boundary expressions include "equal to" (x is greater than or equal to -3 and x is less than or equal to 2) When the boundary includes the number (equal to), we use the square brackets to notate the interval
  • Inequality from graph (practice) | Khan Academy
    Practice writing equations of inequalities graphed on number lines





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