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Despejamos y en la primera ecuación y la sustituimos en la segunda
y = 43-4
2x = 43-x+2
2x+x =43+2
3x = 45
x = 45÷3
x = 15
y = 43-x
y = 43-15
y = 28
x + y = 43 (1)
2x = y + 2 --- 2x-y =2(2)
por el metodo de suma resta multiplicamos (1) a (2)
3x = 45
x= 15
y = 43 - 15 = 28
el numero mayor es 28