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### Course: Geometry (all content)>Unit 6

Lesson 2: Coordinate plane: 4 quadrants

# Plotting a point (ordered pair)

Plotting ordered pairs on a coordinate plane is like a treasure hunt! The first number tells us how many steps to hop right or left on the x-axis. The second number guides us up or down on the y-axis. So, for (6, -8), we hop 6 steps right and 8 steps down. Voila, we've found our treasure! Created by Sal Khan and Monterey Institute for Technology and Education.

## Want to join the conversation?

• Whenever there's, like, (9,2), do you plot the 9 on the y axis, or the x axis?
• just think (x,y)
• What if the ordered pair is (-1, 0)? Then what quadrant is it in?
• If a point is on an axis, it is not considered to be in a quadrant. You would say that the point is on the x axis.
• What is the definition of an ordered pair? Can it be any pair of numbers?
• An ordered pair, as is typically meant in beginning algebra (though there are some more advanced meanings you'll get into later), is the x and y coordinates of a point, stated in that order. Thus, (3,4) is the ordered pair representing the point at x=3 and y=4. (4,3) is not the same, that is the point at x=4 and y=3.

Though you won't see this right away, "ordered pair" can be used to refer to any set of two numbers that have to be put in a specific order in order.
• How would you use plot graphs for equations?
• y=mx+c is the equation to find a STRAIGHT LINE GRAPH.
• How would you use plot graphs for equations?
• How do you plot (3/2,7/2) on a graph?
• Change each improper fraction to a mixed number or decimal.
(3/2,7/2) is (1 1/2, 3 1/2) or (1.5, 3.5)

Hope this helps.
• what if a number is a negative and it was also on the y or x axis?
• I know that in the video Sal is plotting a point, but why does he call it an"ordered pair?"
What even is an ordered pair!?
• An ordered pair is exactly what it sounds like. No fancy language involved. Just 2 numbers on a number line put together in a pair that tells a location on a coordinate grid.
(1 vote)
• What is axis and ordered pair?
• The X-Axis is the name for the number line that runs left/right.
The Y-Axis is the name for the number line that runs up/down.

An ordered pair is written as 2 numbers in parentheses. For example (4, 5).

Each ordered pair gives you the location of a point in the coordiante plane. The center where the 2 number lines intersect is called the origin. The coordinates or ordered pair for that point are (0, 0). For all other points, the coordinates or ordered pair tells you where to move to get from the origin to the point represented by the ordered pair.
(4, 5) means move 4 for X (4 right) and move 5 for Y (up 5).

Hope this helps.