Direct or Not
Direct Proportion Graph
Math Mix Up
Equations
Proportions
100
Tell whether the table represents direct or not. If direct, what is k and the equation. If not direct, why not?
not direct
As x increases, y decreases
or
12/2≠ 6/4
100
Name two features of a Direct Proportion graph
Passes through the origin (0,0)
A straight line
100
The charge for whining is Mr. B's classroom
5 cents
100
Direct or not? If direct, what is k. If not, why not?
5y = 3x + 2
not
direct equations do not have +2
100
6/4 = x/2
Solve the proportion.
x = 3
200
Tell whether table C is represents a direct proportion or not. If direct, what is k and the equation. If not, why not.
Not
x increased and y decreases.
6/1 ≠ 3/2
200
Describe how you can find the constant of proportionality from a direct proportion graph.
Choose a point on the graph and divide the y value by x
200
What is the room number of Mr. B classroom?
217
200
Direct or not? If direct, what is k. If not, why not?
-x+y=0
direct
k= 1
200
3/5 = 12/x
Solve the proportion.
x = 20
300
Direct y=5x
300
Write a direct proportion equation for this graph.
y=x or y = 1x
300
What is a prime number?
A number which has two factors, 1 and itself
300
You are given the direct equation, n = 2c where n is the number of legs you have and c is the number of chickens.
How many chickens do you have 46 legs
23 chickens
300
Solve the proportion.
7/x = 5/3
x = 21/5
400
Is the following equation a direct proportion or not? If so, what is k. If not, why not.
3y = 2x
direct
k = 2/3
400
What is the C.O.P for the graph on the left?
k=20
400
Name this set of numbers:
{1, 2, 3, 4, 5, 6, ....}
Counting numbers of the natural numbers
400
y/x = 0.4
Direct proportion
k=0.4
400
Mikey earned $50 in 4 hours, how much would he earn in 10 hours? Set up and solve as a proportion.
$125
500
If the table below a direct proportion? If so, what is k and the equation. If not, why not
direct,
k = 3/4
y = (3/4)x
500
What does the point (100,2) represent?
At a temperature of 100K the volume is 2
500
Name the artist who drew the picture above the whiteboard in the back of the classroom.
MC Escher
500
Daily Double
y is directly proportional to x. When y is 12, x is 4. \
What is the equation of the direct proportion and what would be the value of x if y =14
y = 3x
x = 14/3
500
If y and x vary directly and the COP is 6 and y=9.6, what is the value of x?
1.6