Then that part of the graph is below the x-axis.
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This is a straight line graph with the equation, y = n where n is any positive or negative number.
In the form y=mx+b, b is the y-intercept and m is the coefficient, so if an equation has a negative coefficient, m<0. As a graph, the slope of the line is negative.
The graph of the equation y=8 is a horizontal line through the y-intercept of 8. This is because since y=8, any point on the graph will have a y-coordinate of 8. This is why it is a horizontal line through (0,8).
It is likely that a horizontal line on a graph will have the equation y=c, where c is a variable.
y=mx+c