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  1. Real-life Examples of Intersecting Lines. Scissors: The two arms of a pair of scissors. Crossroads: Two roads (considered straight lines) meeting at a common point make crossroads. Patterns: The lines on the floor. We use the word “intersection” in daily life in reference to roads or streets.

  2. Definition: The point where two lines meet or cross. Try this Drag any orange dot at the points A,B,P or Q. The line segments intersect at point K. An intersection is a single point where two lines meet or cross each other. In the figure above we would say that "point K is the intersection of line segments PQ and AB".

  3. Example 1: finding the point of intersection using a graph. Find the point of intersection of the lines y=x+4 and y=2x-3. Plot the graph of the first equation. First plot a graph of the equation y=x+4. Draw a table of values (3 or 4 points are sufficient). 2 On the same set of axes, plot the graph of the second equation.

    • Complete the following statements with either sometimes, never, and always. Parallel lines can ____________ be intersecting lines. Perpendicular lines can ____________ be intersecting lines.
    • Which of the following statements is not true? Three intersecting lines can share a common point of intersection. Two intersecting lines form two pairs of vertical angles.
    • Construct a line that will intersect Line $\overline{AB}$. Label the line and intersection point, then name four angles formed by the two intersecting lines.
    • It will be impossible to create four intersecting lines that only share one point of intersection. Prove the statement wrong by constructing a counterexample.
  4. Example 1: finding the point of intersection using a graph. Find the point of intersection of the lines y=x+4 y = x + 4 and y=2x−3. y = 2x − 3. Plot the graph of the first equation. First plot a graph of the equation y=x+4. y = x + 4. Draw a table of values (3 3 or 4 4 points are sufficient). x.

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  6. One method to find the point of intersection is to substitute the value for y of the 2 nd equation into the 1 st equation and solve for the x-coordinate. -x + 6 = 3x - 2. -4x = -8. x = 2. Next plug the x-value into either equation to find the y-coordinate for the point of intersection. y = 3×2 - 2 = 6 - 2 = 4. So, the lines intersect at (2, 4).

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