In this video the tutor shows when to use a dotted line and when to use a solid line while graphing lines in coordinate geometry. He says that we should use a dotted line to plot an inequality which contains the symbols less than or greater than. He also says that we should use a straight line when plotting an inequality which contains the signs less than or equal to and greater than or equal to. He goes on and demonstrates this idea with some examples. This video shows how to use different lines while plotting inequalities on a graph.
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How To: Remember "greater than" & "less than" symbols

How To: Use ">" (greater than) and "<" (less than) symbols

How To: Find the area of a triangle when given 2 sides & angle

How To: Calculate Faster Than a Calculator

How To: Find a number given Its percent

How To: Solve word problems involving domain and range

How To: Do long division without a calculator

How To: Prove a triangle inscribed in a circle is right angled

How To: Find the slope of a line given 2 points with fractions

How To: Do normal probability calculations on a calculator

How To: Calculate the height and volume of a pyramid

How To: Convert improper fractions to mixed numbers quickly

How To: Find a missing side of a triangle, similar to another

How To: Apply the 4th Law of Exponents

How To: Subtract numbers on an abacus calculator

How To: Find the average value of a function over an interval

How To: Find the Percent Given Two Numbers

How To: Figure out the domain & range of a piecewise function

How To: Find the 100th term in a sequence

How To: Find density using the water displacement method
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