Is (4,-2) a solution of the inequality? why or why not

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Worth 15 points handsome jack is buying a pony made of diamonds. the price of the pony is p dollars, and jack also has to pay a 25% diamond pony tax. which of the following expressions could represent how much jack pays in total for the pony? a= p = 1/4 b= p+0.25p c=(p + 1/4)p d=5/4p 0.25p choose 2 answers

Determine if the equation defines y as a function of x: 2xy = 1. yes o no