How can i perform a dilation of 2 on the points (1,-5)

This question awards 100 ! i really don’t want to fail i will also mark you !

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

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?