Exit ticket #9

Which of the following represents direct variation?

• y = kx

• y = k/x

• y = x/k

• y = mx + b

Answer explanation

Which of the following represents inverse variation?

• y = kx

• y = k/x

• y = x/k

• y = mx + b

Answer explanation

When dealing with direct and inverse variation, the k represents what?

• Kangaroo

• K-Mart's Blue Light Special

• Constant of variation

• King Cobra Snake

Answer explanation

Tags

CCSS.HSF-LE.A.1B

What ordered pair does a direct variation always go through when graphed?

• (0, 0)

• (1, 0)

• (0, 1)

• (1, 1)

Answer explanation

True or False:

An inverse variation is always a curve and a direct variation is always a line?

• True

• False

Answer explanation

• direct variation

• inverse variation

• neither direct nor inverse variation

Answer explanation

Direct has to go through the origin.

Inverse has to be curved.

What kind of equation is this?

y=8x

• Linear Equation

• Direct Variation

• Inverse Variation

• Joint Variation

Answer explanation

Graph it if you are not sure what it looks like.

y varies inversely as x. What is the constant of variation when y = 4 and x = 2?

• k = 2

• k = $\frac{1}{2}$

• k = 8

• k = 6

Answer explanation

"varies inversely" so you are using these equations!

Use the table to determine if the function is direct, inverse or neither.

• neither direct or inverse

• direct variation

• inverse variation

Answer explanation

Use the table tool in Desmos to graph the points.

Write a direct variation equation given x and y vary directly and y = 15 when x =3.

• $y=12x$

• $y=\frac{45}{x}$

• $y=5x$

• $y=\frac{1}{5}x$

Answer explanation

"direct variation" so you are using these equations to help you find k.  Then plug k back into  $y=kx$