2. Objectives:
• Summarize concepts related to rectangular
coordinate system;
• State the useful of Cartesian plain in real-life
situations; and
• Create a simple representation that shows the
use of the concept of the rectangular
coordinate system (i.g., shapes, map reading,
etc.)
3. REVIEW!!!
Complete each sentence with the correct
word or phrase.
a. The point with coordinates (-5 , 3) can be graphed
on the ___________________.
b. The coordinates of the origin is __________________.
c. The vertical axis of the Cartesian plane is called the ___.
d. The pair of numbers (2 , 4) is called a/an _____________
pair.
e. In the ordered pair (7 , -8), the -8 is called the ________.
4. REVIEW!!!
f. The x-coordinate is also called the ____________.
g. The intersection of the coordinate axes is called the
____________.
h. To plot the point with the coordinates (4 , -6), start at
the _____________ and move 4 units to the
_______________ and then move 6 units
_______________.
i.
To plot the point with coordinates (- ½ , 3), start at the
_______________ and move ½ units to the
______________ and then move 3 units ____________.
5. REVIEW!!!
Complete each sentence with the correct
word or phrase.
a. The point with coordinates (-5 , 3) can be graphed
on the Cartesian plane/ x-y plane.
b. The coordinates of the origin is (0 , 0).
c. The vertical axis of the Cartesian plane is called the yaxis/ordinate.
d. The pair of numbers (2 , 4) is called a/an ordered pair.
e. In the ordered pair (7 , -8), the -8 is called the yaxis/ordinate.
6. REVIEW!!!
f. The x-coordinate is also called the abscissa.
g. The intersection of the coordinate axes is called the
origin.
h. To plot the point with the coordinates (4 , -6), start at
the origin and move 4 units to the right and then
move 6 units downward.
i.
To plot the point with coordinates (- ½ , 3), start at the
origin and move ½ units to the left and then move 3
units upward.
7. To determine the quadrant for a given
ordered pair, consider the signs of the
coordinates:
(+,+)
means the point is in the first
quadrant
(-,+)
means the point is in the second
quadrant
(-,-)
means the point is in the third
quadrant
(+,-)
means the point is in the fourth
quadrant
9. Example:
In which quadrant is each point
located?
a. ( 7 , -3 )
b. ( 5 , 5 )
c. ( -3 , -8 )
d. ( -10 , 4 )
e. ( 42 , 0 )
10. Assignment:
a. When is an equation called a linear
equation in two variables? Give an
examples.
b. Discuss how you will determine whether
an ordered pair is a solution of a linear
equation in two variables. Give
examples.
