Book Maths Puzzle Algebra

what would the y cordinate be if you graphed these systems of equations?/

3x-y=8
x+2y=-2

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This is a homework question:

Jacques Charles observed that when he plotted the graph of volume of a fix amount of air as a function of the temperature of the aire, the points la Hello...I'm having trouble with this:

y^2+11y+10=0
Please help.