What is the solution to the system of equations below? y=-3x-9 and y=1/3x-39

Barney & noblet customers can choose to purchase a membership for $25 per year members receive 10% off all store purchases 1. how much would a member pay per year if he bought $50 worth of items each year? 2. write a slope-intercept equation that expresses how much a member pays per year using x to represent his purchases per year 3. how much would a member have to spend per year to pay off his membership fee?

If g^-1(x) is the inverse of g (x) which statement must be true

Let x = a + bi and y = c + di and z = f + gi. which statements are true?