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7/3 x - 1/5 y = -8
(5)(7)x-(3)y=-8(15)
35x-3y=-120
3/8 x + 1/10 y = -5/8
5(3)x+(4)y=5(-5)
15x+4y=-25
Despejamos y de ambas:
y=(35x+120)/3
y=(-15x-25)/4
Igualamos:
(35x+120)/3=(-15x-25)/4
4(35x+120)=3(-15x-25)
140x+480=-45x-75
140x+45x=-75-480
185x=-555
x=-555/185
x=-3
Sustituimos x=-3 en el segundo despeje:
y=(-15x-25)/4
y=(-15(-3)-25)/4
y=(45-25)/4
y=20/4
y=5
Entonces, x=-3 e y=5