Addition / Subtraction

53. Addition / Subtraction

Example

\begin{matrix} 3 𝑥 + 2 𝑦 = 12 (Equation 1) \\ 2 𝑥 - 2 𝑦 = 4 (Equation 2) \end{matrix}

\begin{matrix} (3 𝑥 + 2 𝑦) + (2 𝑥 - 2 𝑦) = 12 + 4 \\ 5 𝑥 = 16 \\ 𝑥 = \frac{16}{5} \\ 𝑥 = 3.2 \end{matrix}

\begin{matrix} 3 (3.2) + 2 𝑦 = 12 \\ 9.6 + 2 𝑦 = 12 \\ 2 𝑦 = 12 - 9.6 𝑦 = \frac{2.4}{2} \\ 𝑦 = 1.2 \end{matrix}