The answer is either to change the - 1 to 0, or to add + 1 to it next to the - 1.
Find your x and y intercepts. Once you have those 2 points you can connect them. Use a test point, a point that is not on the line to see what side you're shading. If your test point proves that the equation is false, you shade away from your line. If it's true to shade towards your line.
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