Two classic plays are William Shakespeare's "Romeo and Juliet" and Arthur Miller's "The Crucible." Two modern plays are Tennessee Williams' "A Streetcar Named Desire" and August Wilson's "Fences." These plays are well-known and have been widely studied and performed, making them familiar to many people. **

Functional dependency of two variables refers to the relationship between the values of one variable and the values of another variable. It means that the value of one variable uniquely determines the value of another variable. In other words, if we know the value of one variable, we can determine the value of the other variable with certainty. This concept is important in database management and helps in organizing and structuring data efficiently. **

Keeping two kittens can be a great idea as they can provide each other with companionship and entertainment. They can also help each other learn social skills and burn off energy through play. However, it's important to consider the additional responsibility and cost of caring for two kittens, including providing enough space, food, and veterinary care for both. It's also important to ensure that both kittens receive individual attention and training to prevent behavioral issues. **

It depends on the specific smart home systems in question. Compatibility between smart home systems can vary based on the brands and protocols they use. Some smart home systems are designed to be compatible with a wide range of devices and platforms, while others may be more limited in their compatibility. It's important to research and confirm compatibility between the two smart home systems before attempting to integrate them. This can often be done by checking the product specifications or contacting the manufacturers for more information. **

The functional equation of these two graphs is y = f(x) + g(x), where f(x) represents the first graph and g(x) represents the second graph. This equation represents the sum of the two functions at each value of x. In other words, the value of y at a given x is the sum of the values of f(x) and g(x) at that x. This functional equation allows us to combine the two graphs to see their combined effect on the y-axis. **

Modern music suitable for two voices includes duets from various genres such as pop, R&B, country, and musical theater. Some popular examples of modern duets include "Shallow" by Lady Gaga and Bradley Cooper, "The Prayer" by Celine Dion and Andrea Bocelli, "Say Something" by A Great Big World and Christina Aguilera, and "Lucky" by Jason Mraz and Colbie Caillat. These songs often feature harmonies and complementary vocal parts that make them well-suited for two voices. **

The functional equation that passes through two points can be written in the form of y = mx + b, where m is the slope of the line and b is the y-intercept. By plugging in the coordinates of the two points into the equation, we can solve for the values of m and b. This equation represents a straight line passing through the two given points on a Cartesian plane. **

Some modern duets for two female voices include "The Boy Is Mine" by Brandy and Monica, "Telephone" by Lady Gaga and Beyoncé, and "Fall in Line" by Christina Aguilera and Demi Lovato. These duets showcase the powerful vocal abilities of the artists and often feature themes of empowerment and independence. Additionally, there are many contemporary musical theater duets for two female voices, such as "For Good" from Wicked and "I Know Him So Well" from Chess. **