y=-1
No matter what value x has, y is always -1, so the graph is a horizontal line passing through (x,y)=(0,-1).
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Same way you graph y = -4x - 0.5
The graph shifts downward (negative y) by 9 units.
4
y = x + 3The graph of that equation is a straight line with a slope of 1 (45° rising to the right)and passing through the point y=3 on the y-axis.
y = x - 3The graph is a straight line, passing through the point [ y = -3 ] on the y-axis,and having a slope of [ 1 ].