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.
$7$ The sum of $1$ two consecutive natural numbers is $79$ Find the two numbers. $1$ $Hint$ If $x$ $1$ $1$ $0$ one of the numbers, then the consecutive number $1sx+1$
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