Question

Which method is the best way to solve the system shown below? 3x + 4y = 12 3x - 4y = 5

Answer 1

Answer:

$3x + 4y = 12 \\ 3x - 4y = 5 \\ 6x = 17 \\ x = \frac{17}{6} \\ 3 \times \frac{17}{5} - 4y = 5 \\ 51 \div 5 - 4y = 5 \\ \\ 10.2 - 5 = 4y \\ y = \frac{5.2}{4}$