How to display only one reference for equation using \align?

by Elisa m   Last Updated September 11, 2019 09:23 AM

Good morning. I would like to understand how to write this equation and receive only one reference (example: equation 1.1) and not euqation 1.1 and 1.2 relative to the second line of the equation. This is my code:

\graphicspath{ {Figures/} }

style=apa, backend=biber

\usepackage[justification = centering]{caption}

\text{from}\quad r_i\geq20;\quad i= p+q \quad\text{where}\quad 
p= count[r_{j(i)}=0]\\ 


Thanks in advance!

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