What Does Intersect Mean in Math?

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Simply put, an "intersect" in mathematics is a point where two geometric figures meet. Learn about what intersect means in math with help from an experienced mathematics educator in this free video clip.

Part of the Video Series: Elementary Math
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Video Transcript

Hi my name is Marija. I'm a mathematician and today I'm going to tell you what intersect means in math. So intersect is a point at which two geometric figures meet and there can be a lot of different types of intersections so we're just going to talk about lines to make it simple for us. So on a coordinate plane we're going to go ahead and draw two lines, so here's my X and my Y axis and I'm going to draw one line going this way and I'm going to draw another line going this way and one, two, one, two, three, this coordinate right here looks like it might be somewhere around the ordered pair 2, 3. So I have one line, I have another line and at the point 2, 3, they meet and that's what we call an intersection, the two lines are intersecting and at the point of intersection that means that each of these two lines contain the point 2, 3. So we say that 2, 3 is the solution for each of these lines okay. Now things can intersect in more than one place if we start dealing with more complex figures. So if I decided to draw a parabola in here now which is a U shape, let's say I go ahead and draw a parabola. My parabola intersects this line right here at this point but if I continue to extend my parabola up, it's also going to intersect both of these lines right? So an intersection is just the point of meeting and there can be one or there can be multiple points of intersection. My name is Marija and I just showed you what it means to intersect in math.


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