Blog de Matemáticas de Patricia Sánchez
Introduction To Functions - 3ºeso
FUNCTIONS
1. Fill in the
gaps.
When
working with equations that have two (1)__________, the coordinate plane is an
important tool. It's a way to draw pictures of equations that makes them easier
to understand.
To
create a coordinate plane, start with a sheet of graph paper. Next, draw a
(2)__________ line. This line is called the x-axis and is used to locate values
of x. To show that the axis actually goes on forever in both directions, use
small arrowheads at each end of the line. Mark off a number line with
(3)__________ in the center, positive numbers to the (4)__________, and
negative numbers to the (5)__________.
Next
draw a (6)__________ line that intersects the x axis at zero. This line is
called the y-axis and is used to locate the values of y. Mark off a number line
with zero in the center, (7)__________ numbers going upwards, and (8)__________
numbers going downwards. The point where the x and y axes intersect is called
the origin. The origin is located at (9)__________ on the x axis and zero on
the y axis.
Locating
Points Using Ordered Pairs
We
can locate any point on the coordinate plane using an ordered pair of numbers.
We call the ordered pair the coordinates of the point. The coordinates of a
point are called an ordered pair because the order of the two (10)__________ is
important.
The
first number in the ordered pair is the (11)__________ coordinate. It describes
the number of units to the left or right of the origin. The second number in
the ordered pair is the (12)__________ coordinate. It describes the number of
units above or below the origin. To plot a point, start at the (13)__________
and count along the x axis until you reach the x coordinate, count right for
positive numbers, left for negative. Then count up or down the number of the y
coordinate (up for (14)__________, down for (15)__________.)
Quadrants
To
make it easy to talk about where on the coordinate plane a point is, we divide
the coordinate plane into four sections called quadrants.
Points
in Quadrant 1 have positive x and positive y coordinates.
Points
in Quadrant 2 have (16)__________ x but (17)__________ y coordinates.
Points
in Quadrant 3 have (18)__________ x and (19)__________ y coordinates.
Points
in Quadrant 4 have (20)__________ x but (21)__________ y coordinates.
horizontal left
negative negative negative
negative negative negative
numbers origin positive
positive positive positive
right variables vertical
x y zero
zero
2. Match each word with its translation in
Spanish.
COORDINATE PLANE EJES
CARTESIANOS
DEPENDENT VARIABLE VARIABLE
DEPENDIENTE
INDEPENDENT VARIABLE FUNCIÓN
FUNCTION PAR
ORDENADO
SET
OF POINTS VARIABLE
INDEPENDIENTE
3. Complete the Crossword.
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