How do I change the opacity of an image when I hover of my text?

Hey I'm new here and I really need some help! I have my own website, please don't judge I am new to HTML and CSS.. The problem is that I don't know how to change the opacity when I hover over my text.. I want it to become lighter if I'm hovering over my text in the menu on the right. Does anyone know how I can do this? Right now It's only changing when I hover over the image itself, the text changes too, but I want it to both change at the same time and on the same object, so I hover over the text; text changes and images opacity changes. Please help me out! Luca

http://ift.tt/1aelVNP