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X=5+4x/7
9 (5+4x/7)+8x=13
45/7+36x/7+8x=13
92x/7=13-45/7
92x/7=46/7
X=46/7 (7/92)
X=1/2
7x+8y=5
7 (1/2)+8y=5
7/2+8y=5
8y=5-7/2
8y=3/2
Y=3/2/8
Y=3/16
Comprobación
7x+8y=5
7 (1/2)+8 (3/16)=5
3.5+1.5=5
5=5