$$ \begin{aligned}2y^2+3y-5y^2+y& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-3y^2+4y\end{aligned} $$ | |
① | Combine like terms: $$ \color{blue}{2y^2} + \color{red}{3y} \color{blue}{-5y^2} + \color{red}{y} = \color{blue}{-3y^2} + \color{red}{4y} $$ |