(100 PTS)PLS HELP WILL GIVE BRAINLIEST!!!!!!!

Answer:
y-3/4
Step-by-step explanation:
y^2 - 9 can be simplified using difference of two squares to (y+3)(y-3)
4y +12 can be simplified to 4(y+3)
Cancel out the (y+3) from the top and bottom of the fraction
You are left with y-3 / 4