Which of the following is not one of the main purposes an author has for writing? Social media: Itsjackenley

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

Precalculus question, image attached.

When you have 25 numbers, and jake picks 3 random numbers and puts them back, what is the chance bob has of picking those 3 numbers when he picks 6 random numbers (without putting them back)? explain.