Direct and Inverse Variation Practice

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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
your math grade.




      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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posted:9/28/2012
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