Question

Es la solución del siguiente sistema de ecuaciones lineales con dos incógnitas: 2x+3y=15 5x+4y=13 , .

Answer 1

2x+3y = 15
2x = 15-3y
x = (15-3y)/2

5x+4y = 13
5*((15-3y)/2) + 4y = 13
(75-15y)/2 + 4y = 13
(75-15y)/2 = 13-4y
75-15y = 26-8y
49 = 7y
49/7 = y
7 = y

2x+3y = 15
2x+3*7 = 15
2x+21 = 15
2x = -6
x = -6/2
x = -3