Review for 2nd Quarter exam Math 9

    Given xy=12, which of the following terms describes the relationship between x and y?

•    Direct variation

• Inverse variation

• Combined variation

•       Joint variation

Free -Falling Bodies .From a platform 4 feet high , Sophia throws a ball upward with an initial velocity of 16 feet /  second . The height , h(t), of the ball t seconds after the launch is given by the function h(t)= -16 What is the maximum height reached by the ball?

•  6 feet

• 7 feet

• 8 feet

• 10 feet

     Which is the variation equation if the area of a triangle varies jointly as the base and height?

•   A=kbh

•     A=hk

   The price of a skirt varies jointly as its length and waist size. If the length is 24 inches and the waist size is 32 inches , the skirt is priced at ₱ 280 . How much will a skirt cost if the length is 26 inches and the waist size is 36 inches?

• ₱ 340.25

•   ₱ 341.25

•     ₱ 342.25

• ₱ 342.50

   If y varies inversely as x, given y=3 when x=8, find the constant of variation k .

• 20

• 18

• 15

• 24

    Which of the following situation is an example of a direct variation.

• The land area property a to its price p

•    The number of workers w to the working hours h

• The number of kids n to the number of balloons b, and toys t.

•     The time travelled by a bus t to its speed s

= If y varies directly as x and y = 18 when x = 3, Find y when x = 7.

• 16

• 42

• 34

• 49

  In the equation y=kx, k is called the ____

•      Independent Variable

• Constant of Variation

•    Dependent Variable

• Statement of Variation

  If y varies jointly as x and z, given y=12 when x=3 and z=2 , find the constant of variation k .

• 2

• 3

• 4

• 5

   It refers to the set of all allowable values for x or the independent variable

• Range

• Vertex

• Axis of symmetry

• .      Domain