Exploring Direct Variation and Proportionality

What is the formula for direct variation?

• y = K + X

• y = K / X

• y = X - K

• y = K * X

In the formula for direct variation, what does K represent?

• A variable

• A coefficient

• A constant that equals zero

• A constant that does not equal zero

What is another term often used in word problems to describe direct variation?

• Linearly proportional

• Exponentially proportional

• Directly proportional

• Inversely proportional

In the example problem, what is directly proportional to the length of one of the sides of the square?

• Area

• Diagonal

• Volume

• Circumference

Tags

CCSS.8.EE.C.7B

What is the value of the constant of variation (K) in the example problem?

• 1

• 5

• 20

• 4

Tags

CCSS.HSF-LE.A.1B

What is the length of one of the sides of the square in the example problem?

• 4

• 20

• 1

• 5

Tags

CCSS.8.EE.A.2

What is the unknown variable (Y) in the example problem?

• Area

• Diagonal

• Circumference

• Length of a side

Tags

CCSS.8.EE.A.2

What is the formula used to find the circumference of the square in the example problem?

• Y = 5 - 4

• Y = 4 / 5

• Y = 4 + 5

• Y = 4 * 5

Tags

CCSS.4.MD.A.3

What is the circumference of the square in the example problem?

• 5

• 4

• 1

• 20

Tags

CCSS.4.MD.A.3

Which formula is used to solve direct variation problems?

• y = K / X

• y = K + X

• y = K * X

• y = X - K