An Introduction to Variation (2.10.1)

Question 1

• Variation is the notion that two quantities can increase or decrease in relation or proportion to each other.

Answer 1

• Variation is the notion that two quantities can increase or decrease in relation or proportion to each other.

Question 2

• If two quantities are directly proportional, it means that if one changes by a certain percentage, the other changes in the same way and by the same percentage.

Answer 2

• If two quantities are directly proportional, it means that if one changes by a certain percentage, the other changes in the same way and by the same percentage.

Question 3

• Two quantities usually are directly proportional without being the same size.

Answer 3

• Two quantities usually are directly proportional without being the same size.

Question 4

• If two quantities are inversely or indirectly proportional, it means that if one grows by a certain percentage, the other decreases by the same percentage.

Answer 4

• If two quantities are inversely or indirectly proportional, it means that if one grows by a certain percentage, the other decreases by the same percentage.

Question 5

• The constant of change is usually referred to as “k.”

Answer 5

• The constant of change is usually referred to as “k.”

Question 6

• The variable x is directly proportional to y if x = ky.

Answer 6

• The variable x is directly proportional to y if x = ky.

Question 7

• The variable x is inversely proportional to y if x = k/y.

Answer 7

• The variable x is inversely proportional to y if x = k/y.