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2(y+5)=7x
——————
3x+6=2y
2y+10=7x
———————
3x—2y = —6
—7x+2y= —10
————————
encontrando x :
—4x = — 16
x = 4
encontrando y :
3x—2y = —6
—7x+2y= —10
————————
3x (7) —2y(7) = —6(7)
—7x(3) + 2y(3)= —10(3)
————————————
21x—14y = —42
—21x+6y = —30
——————————
—8y = — 72
y = 9
resultado:
x = 4
y = 9