I don't know, it has variables in it... Ugh finding a section is hard.

Prove $\displaystyle \frac{x+ab}{y+ab} \geq \frac{x}{y}$

because I moved countries a lot when I was little I think I missed out on most of the fraction axioms taught in elementary (took me to the end of high school to figure out cross multiplication >.>) so it might be that I'm missing some fundamental rule here...