The equation for the slope of a linear equation is Y=Mx+b, where m is the slope of the line, (Rise over run) and where B is the Y-intercept. (Where it crosses the Y axis)
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The graph will be a line.
any points along the line described by the equation x=anything will give you a vertical line on a graph
When it is a linear equation.
This is a straight line graph with the equation, y = n where n is any positive or negative number.
It is likely that a horizontal line on a graph will have the equation y=c, where c is a variable.