# Direct and Inverse Variation Practice by dffhrtcv3

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```									Direct and
Inverse
Variation
Practice
Direct or Inverse?

x 5 10 15 30
y 90 45 30 15
INVERSE
Direct or Inverse?
Samantha makes \$15.25 an hour
working at the mall. How would
you determine how much she
makes weekly?

DIRECT
Direct or Inverse?

(2, 3), (1, 6),
(3, 2), (6, 1)
INVERSE
Direct or Inverse?

y = 4/3x
DIRECT
Direct or Inverse?
The more cookies you make, the
more chocolate chips you need.

DIRECT
Direct or Inverse?

y = 100/x
INVERSE
Direct or Inverse?

INVERSE
Direct or Inverse?
Mr. Jones has \$4,000 to give to
employees for holiday bonuses.
He wants to give each employee
the same amount of money. How
would he decide how much to
give each employee?

INVERSE
Direct or Inverse?

6y = x
DIRECT
Direct or Inverse?

xy = 3
INVERSE
Direct or Inverse?
The faster you run, the less time it
takes to finish.

INVERSE
Direct or Inverse?

DIRECT
Direct or Inverse?

y/x = 4
DIRECT
Direct or Inverse?

(4, 2), (3, 1.5),
(2, 1), (1, .5)
DIRECT
Direct or Inverse?

x     6 9 12 15
y     1 3/2 2 5/2
DIRECT
Direct or Inverse?
The more you study, the higher

DIRECT
Practice Problems

x varies directly with y. If
x = 16 when y = 4, what
is the value of y when
x = 2?
y = 1/2
Practice Problems
Miss Isaacs is making the 818 mile
drive to Texas. Write an equation
that relates Miss Isaacs’s average
driving speed “d” (miles per hour)
and the time “t” (in hours) that Miss
Isaacs will take to finish the drive?

t = 818/d
Practice Problems

If y = 12 and x = 3, using
an inverse variation,
what is the value of y
when x = 9?
y=4
Practice Problems

Y varies directly with x.
If y = 6 and x = 2, what is
the value of y when x =
5?
y = 15
Practice Problems
Ms. Olejack drives home from
school in 10 minutes traveling
40 mph. Today she needs to
get home 2 minutes faster.
How fast must she drive her

50 mph
car?
Practice Problems

The variables x and y
vary inversely and y = 6
when x = 4. What is the
constant of variation?
k = 48
Practice Problems
The variables x and y
vary inversely. How
does the value of y
change if the value of x
is halved?
y would be doubled

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