An electrician earns 100 dollars for a project installing light fixtures. she must pay for the light fixtures herself and they cost 2 dollars and 50 cents each at the hardware store. create an equation to represent her profit from the project. let x represent the number of light fixtures and y represent her total profit (the amount of money she has left over after paying for the light fixtures). if she wants to earn a profit of 75 dollars from this project, how many fixtures should she plan to install? show your work