how do you find whats equivalent to 1/y-1/4
I assume they want you to simplify to 1 fraction.
multiply the first fraction by 4/4 and the second fraction by y/y
4/4y -y/4y or (4-y)/4y nothing will cancel here so that is your final answer
multiply the first fraction by 4/4 and the second fraction by y/y
4/4y -y/4y or (4-y)/4y nothing will cancel here so that is your final answer