Since we have to solve this system graphically, we'll have to draw both lines.
To draw a line, simply build a little tables with two x,y values: for the first line we have
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So, you can draw the points (0,3) and (1,2), connect them, and you'll have the graph of the line

For the second line we have
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So, you can draw the points (0,5) and (1,6), connect them, and you'll have the graph of the line
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Finally, we have to check where the two lines cross. If your drawing is accurate enough, you'll see that the point you're looking for is (-1, 4)