The Coordinate Plane

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The Coordinate Plane
By Mr. Jay Mar Bolajo
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Definition
Coordinate Plane

• The plane formed when 2 perpendicular number
  lines intersect at their zero points

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Coordinate Plane

• The perpendicular number lines form a grid on the
  plane

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X-axis

• The horizontal number line
• Positive to the right
• Negative to the left

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Y-axis

• The vertical
• number line
• Positive upward
• Negative downward

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Origin

• Where the x and y axes intersect at their zero
  points

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Quadrants

• The x and y axes divide the coordinate plane into
  4 parts called quadrants

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II
I
IV
III
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Ordered Pair

• A pair of numbers (x , y) assigned to a point
  on the coordinate plane

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Ordered Pair
X-coordinate

• (x , y)

Y-coordinate
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y
Quadrant 1
Quadrant 2
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( - , )
( , )
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Origin
1
-x
x
1
2
3
-2
-3
-1
-1
-2
( - , - )
( , - )
-3
Quadrant 4
Quadrant 3
-y
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Plotting a Point

• Step 1
• Begin at the Origin

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Plotting a Point

• Step 2
• Locate x on the x-axis

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Plotting a Point

• Step 3
• Move up or down to the value of y

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Plotting a Point

• Step 4
• Draw a dot and label the point

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In Your Own Words

• What is a coordinate plane?
• Define origin
• How do you plot a point?