What is the solution to the system? x + y = -4 -2x + y = 2

Determine the number of outcomes in the event. decide whether the event is a simple event or not. upper a computer is used to select randomly a number between 1 and 9 comma inclusive. event upper b is selecting a number greater than 4. event upper b has nothing outcome(s). is the event a simple event? (yes or no) because event upper b has (fewer than, exactly, more than) one outcome.

Can any one me with the answers to these questions asap?

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0