Variation

The table shows that y is directly proportional to x. What number completes the table? Calculate the answer as a decimal.

An equation shows m is directly proportional to n and inversely proportional to s cubed. When m = 5, then n = 160 and s = 2. What is the constant of proportionality? Write your answer as a fraction.

What is the constant (k) in this inverse variation?

• 12
• 24
• 48
• Not enough information given

What kind of variation is shown in the graph?

• Direct
• Inverse

• direct variation
• inverse variation
• neither direct nor inverse variation

If y varies inversely as x and x=5 when y=20, then what is the constant of variation, k? 

• 121
• 4
• 100
• 6

Write the equation for the table given.

• y = 1/3x
• y = 3x
• y = 1/2x

If p is inversely proportional with q and p = 3 and q = 9, what is the constant of proportionality?

• 
  

  $\frac{1}{3}$
  

• $18$

• $3$

• $27$

If r varies directly as s and r = 6 when s is -10, find r when s is 30.

• 
  

  $-\frac{1}{18}$
  

• $18$

• $-18$

• $-2$

• direct variation
• inverse variation
• neither direct nor inverse variation