## Standards of Learning (SOL)

 Essential Knowledge and Skills

• Given a data set or practical situation, determine whether a direct variation exists.
• Given a data set or practical situation, determine whether an inverse variation exists.
• Given a data set or practical situation, write an equation for a direct variation.
• Given a data set or practical situation, write an equation for an inverse variation
• Given a data set or practical situation, graph an equation representing a direct variation.

## Resources

Vocabulary
Variation, direct variation, inverse variation, constant, directly proportional, origin, constant of proportionality, ratio, dependent variable, independent variable, constant of variation

## Vertical Articulation

Post Standard of Learning

AII.10          The student will represent and solve problems, including practical problems, involving inverse variation, joint variation, and a combination of direct and inverse variations.

 The student will investigate the passage of time and a) tell time to the hour and half-hour, using analog and digital clocks; and b) read and interpret a calendar.
 The student will investigate the passage of time and a) tell time to the hour and half-hour, using analog and digital clocks; and b) read and interpret a calendar.
 The student will investigate the passage of time and a) tell time to the hour and half-hour, using analog and digital clocks; and b) read and interpret a calendar.

## Essential Questions

• How can you determine whether a direct variation exists in a data set or practical situation?
• How can you determine whether an inverse variation exists in a data set or practical situation?
• What is the difference between direct and inverse variation?
• How do you write an equation for a direct variation situation?
• How do you write an equation for an inverse variation situation?
• How do you graph an equation representing a direct variation?