Understanding Linear Equations in Real-World Applications

The video tutorial explains a linear equation problem involving statins, a top-selling drug in the U.S. The equation S - 1.4X = 5.6 represents the sales of statins in billions of dollars, X years after 1998. The tutorial guides viewers through calculating the value of X for the year 2015, substituting it into the equation, and solving for S to determine the U.S. expenditure on statins in 2015, which is $29.4 billion.

What is the primary purpose of statins as mentioned in the video?

• To improve digestion

• To keep cholesterol in check

• To increase blood pressure

• To enhance memory

What does the variable 'S' represent in the equation S - 1.4X = 5.6?

• The number of years after 1998

• The amount of sales in billions of dollars

• The population of the U.S.

• The price of statins per unit

How do you calculate the value of X for the year 2015?

• Add 1998 to 2015

• Divide 2015 by 1998

• Multiply 1998 by 2015

• Subtract 1998 from 2015

What is the value of X for the year 2015?

• 15

• 16

• 17

• 18

What operation is performed to isolate S in the equation S - 23.8 = 5.6?

• Divide both sides by 23.8

• Multiply both sides by 23.8

• Add 23.8 to both sides

• Subtract 23.8 from both sides

What is the final calculated sales amount for statins in 2015 according to the equation?

• $5.6 billion

• $23.8 billion

• $29.4 billion

• $17 billion

Which mathematical operation is used to solve for S after substituting X?

• Division

• Multiplication

• Subtraction

• Addition