Question

AYUDA ES URGENTE!!!!!!
se trata de un sistema de ecuacion lineal 2x2
7a+4b=13
5a-2b=19

Answer 1

a= 3
b= -2

Espero te sirva :)
...............

Answer 2

7a + 4b = 13             (1)
5a - 2b = 19              (2)

Resolvemos por el método de reducción
(2) x 2            10a - 4b = 38       (3)
(1) + (3)          17a = 51
                            a = 51/17               a = 3
a en (1)  [si prefieres puedes usar 2]
                           7(3) + 4b = 13
                           21 + 4b = 13                            4b = 13 - 21 = - 8
                             b = (- 8)/4                b = - 2
                                                                                     Solución
                                                                                 a = 3        b = - 2