Solve the system of equations 2x-y=1; x+2y=8 graphically and find the coordinates of the points where corresponding lines intersect y-axis.
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$1$ $3$ $40$ $12$ $56$ $\left($ $A\right)$ $400000$ $\left($ (B) $B\right)$ $4000000$ $\left($ $C\right)$ $40000$ $\left($ (D) $4000$ $0$ $2$ $2$
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