Chapter 7
Chapter 7 (p. 357)
Grade 7 Flashcards
The constant k in direct and inverse
variation equations.
constant of variation
y � 5x
constant of variation
Chapter 7 (p. 338)
A polynomial function of degree 3.
y � x3
cubic function
Chapter 7 (p. 357)
A relationship between two variables
in which the data increase or decrease
together at a constant rate.
y
4
direct variation
2
x
2
�4 �2
4
�4
y � 2x
Chapter 7 (p. 330)
A function whose graph is a straight
line.
y�x �1
linear function
4
y
2
x
�4 �2 O
2
4
�4
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Chapter 7
Chapter 7 (p. 322)
Grade 7 Flashcards
The x- and y-axes divide the coordinate
plane into four regions. Each region is
called a quadrant.
quadrant
Quadrant II
Quadrant I
O
Quadrant III Quadrant IV
Chapter 7 (p. 334)
A function of the form y  ax2  bx  c,
where a  0.
quadratic function
y  x2  6x  8
Chapter 7 (p. 344)
rate of change
Chapter 7 (p. 327)
A ratio that compares the amount of
change in a dependent variable to the
amount of change in an independent
variable.
The cost of mailing a letter increased
from 22 cents in 1985 to 25 cents in 1988.
During this period, the rate of change was
change in cost
25  22
______________
 ___________

1988  1985
change in years
3  1 cent per year.
__
3
A test used to determine whether a
relation is a function. If any vertical line
crosses the graph of a relation more
than once, the relation is not a function.
vertical line test
5
y
5
�5
x
�5
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