Question

............ayudenme por favor.................

Answer 1

Explicación paso a paso:

$x + y = 61 \\ x = 3y - 12 \\ \\ 3y - 12 + y = 61 \\ 4y - 12 = 61 \\ 4y = 61 + 12 \\ 4y = 73 \\ y = \frac{73}{4} \\ x = 3( \frac{73}{4} ) - 12 \\ x = \frac{219}{4} - 12 \\ x = \frac{219 - 48}{4} \\ x = \frac{171}{4}$