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x/2+y/3=3
x=4+8y/7
remplazamos en la ecuación 2
(4+8y/7)/2+y/3=3
4+8y/14+y/3=3
38y+12/42=3
38y+12=3*42
38y=126-12
38y=114
y=114/38
y=3
entonces remplazamos el valor de y en la primera ecuación
7x-8y=4
7x-8(3)=4
7x-24=4
7x=4+24
7x=28
x=.4 :)