Equations of Proportional Relationships

Writing Equations of Proportional Relationships

Writing Equations

• I can... Write an equation from a table to represent a proportional relationship

• I can... write an equation from a word problem to represent a proportional relationship

• I can... write an equation from a graph to represent a proportional relationship

Writing an Equation from a Table

Multiple Choice

What is the equation that represents the the relationship between x and y from the table?

• $y=2x$

• y=4x

• $y=\frac{1}{8}x$

• y=8x

Multiple Choice

What is the equation that represents the the relationship between x and y from the table?

• $y=\frac{1}{200}x$

• $y=200x$
  

• $y=2x$

• y=0.2x

Multiple Choice

What is the equation that represents the the relationship between x and y from the table?

• y=33k

• x=33y

• y=33x

• y=0.033x

Writing Equations from Word Problems

Multiple Choice

Slimy slug travels 6 inches in 1 minute.

Write an equation where y represents the distance traveled in inches and x represents the number of minutes.

• y=0.6x

• y=66x

• k=6x

• y=6x

Multiple Choice

Picky Peter eats 10 pickles per week.

Write an equation where y represents the amount of pickles eaten and x represents the number of weeks.

• x=10k

• y=10x

• 10=kx

• y=kx

Multiple Choice

Aisha can finish 45 braids in an hour.

Write an equation where y represents the number of braids and x represents the number of hours.

• y=kx

• k=45x

• x=45

• y=45x

Multiple Choice

A bag of apples costs $19.50 for 15 apples.

Find the constant and then write an equation where y represents the cost x represents apples.

• y=1.25x

• y=1.75x

• y=2.00x

• y=1.30x

Writing an Equation from a Graph

Multiple Choice

Write an equation where y represents the cost and x represents number of concert tickets.

• y=0.2x

• y=2.20x

• y=2.00x

• y=20x

Multiple Choice

Write an equation where y represents protein and x represents the amount of milk.

• y=1/8x

• k=1/8

• y=8x

• y=0.8x

Multiple Choice

Write an equation where y represents amount of water used and x represents the amount of time.

• y=5x

• y=15x

• y=1/5x

• y=0.5x

Multiple Choice

Write an equation where y represents the distance and x represents the amount of time.

• k=6/5

• y=6/5x

• y=5/6x

• y=6x