7th Proportional Reasoning

Pamela rode her bike at a constant rate of 0.1 kilometer per minute. Which table represents y, the number of kilometers Pamela rode her bike in x minutes?

• 
• 
• 
• 

Answer explanation

Cheddar cheese costs $4.25 per pound. Which equation best represents y, the total cost of x pounds of cheddar cheese?

• $x\ =\ 4.25\ +\ y$

• $x\ =\ 4.25y$

• $y\ =\ 4.25+x$

• $y=4.25x$

Answer explanation

A worker uses 450 inches of steel wire to make 300 springs of the same size. At this rate how many inches of steel wire are needed to make 1 spring?

• $\frac{1}{3}in$

• $\frac{1}{15}in$

• $\frac{2}{3}in$

• $1\ \frac{1}{2}in$

Answer explanation

A recipe says to use 3 cups of flour to make 48 cookies. What is the constant of proportionality that relates the number of cookies made, y, to the number of cups of flour used, x?

• 0.6

• 48

• 3

• 16

Answer explanation

Is the graph proportional?

• yes
• no

Is the graph proportional?

• yes
• no

Why does this graph show a non-proportional relationship?

• Because it is proportional
• It goes through the origin
• It does not go through the origin
• It is a straight line

Is the graph proportional?

• yes
• no

At what rate did the rain fall?

• 2 cm per hour
• ¹/₄ cm per hour
• ¹/₂ cm per hour
• 4 cm per hour

Is this table proportional?

• Yes
• No