Question

metodo de sustitucion

a) x-y=1
2x-3y=5

Answer 1

Saludos,

x - y = 1
y = x + 1
x - x + 1 = 1
0x +1 =1
0x = 1-1
0x = 0
0 -  0 + 1 = 1
1 = 1

2x - 3y = 5
-3y = 5 - 2x
3y = -5 + 2x
y = (-5 + 2x)/3

2x - 3(-5 +2x)/3 = 5
2x + 5 - 2x = 5
2x-2x = 5 - 5
0x = 0 
y = (-5 + 2*0)/3
y = -5/3

2*0 -3(-5/3) = 5
5 = 5

Espero te sirva