Question

{4x+y=18}

{5x-6y=12}

Answer 1

•Amplificar para eliminar una incógnita:
4x+y=18/×6
5x-6y=12
----------------
24x+6y=108
+5x-6y=12
------------------
29x=120
$x = \frac{120}{29}$
•Reemplazar x para sacar y:
$4 \times \frac{120}{29} + y = 18$
$\frac{480}{29} + y = 18$
$y = 18 - \frac{480}{29}$y= \frac{42}{29}