When x = 0, the point that has (0, y) coordinates will be on the y-axis for any y.
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It is the point of origin of the x and y axes of the graph
There needs to be an x variable to create a graph.
solve for y so if x + y = 0 then y = -x
0 5 /--------------/-----•------/
First convert it to Y= y-x+4=0 y=x-4 The graph has a slope of 1 and the y-intercept is (0,-4)