Question
Answer
$$10y\cdot2+15y-7+9y\cdot2+2y+11=55y+4$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}10y\cdot2+15y-7+9y\cdot2+2y+11& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}20y+15y-7+18y+2y+11 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}35y-7+20y+11 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}55y+4\end{aligned} $$ | |
| ① | $$ 10 y \cdot 2 = 20 y $$$$ 9 y \cdot 2 = 18 y $$ |
| ② | Combine like terms: $$ \color{blue}{20y} + \color{blue}{15y} -7 = \color{blue}{35y} -7 $$Combine like terms: $$ \color{blue}{18y} + \color{blue}{2y} +11 = \color{blue}{20y} +11 $$ |
| ③ | Combine like terms: $$ \color{blue}{35y} \color{red}{-7} + \color{blue}{20y} + \color{red}{11} = \color{blue}{55y} + \color{red}{4} $$ |
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