Graphing Proportional Relationships
Equations of Proportional Relationships
Identifying Proportional Relationships
100
what coordinate point is the origin?
0,0
100
Is this equation proportional? y= 3x
If so what is the constant of proportionality? (K)
Yes
k=3
100
Which table does not show a proportional relationship?
A
200
Is this relationship proportional?
No
200
Is this equation proportional? If so what is the constant of proportionality? (K=)
y= 4x + 10
Not proportional
200
Is the graph a proportional relationship? Why?
NO
Does not go through the origin
300
what are 3 ways to tell if a graph is proportional
if the line is straight
goes through the origin
has a constant
300
Is this equation proportional? If so what is the constant of proportionality? (K=)
y= ¾ x
proportional
k= 3/4
300
Is the table proportional?
No
400
Is this graph proportional?
YES
400
Using this graph, What is the equation? 
y= 1/6x
400
Is the table proportional?
Yes it is proportional
500
Write an equation that relates gallons of water used (w) to time (m).
w = 5m
500
Write an equation for the table given the table is proportional.
Y= 3/2 x
500
Write an equation that represents the proportional relationship between pounds of apples (p) and total cost (c).
c = 3p