Question
Answer
$$x+y-2-(2x+7y+9)=-x-6y-11$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}x+y-2-(2x+7y+9)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}x+y-2-2x-7y-9 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-x-6y-11\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 2x+7y+9 \right) = -2x-7y-9 $$ |
| ② | Combine like terms: $$ \color{blue}{x} + \color{red}{y} \color{green}{-2} \color{blue}{-2x} \color{red}{-7y} \color{green}{-9} = \color{blue}{-x} \color{red}{-6y} \color{green}{-11} $$ |
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