solve for y
so if x + y = 0
then y = -x
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Its kind of hard to draw a graph in pure text... Try plugging your equation into www.wolframalpha.com/ ;)
It's essantially y = x+7. So just graph that. (y = mx+b format) , or draw a diagnol line that crosses through 7 on the y axis.
Graph any two numbers that add together and get -3. Like, (5,-8) (0,-3) and then draw a line through them.
y=2x+1/2 when x=0, y=1/2 so one point is (0, 1/2) when y=0, x=-1/4 so another point is (-1/4, 0) then you plot both points on the graph and draw a line.