Question 203227
y=mx+b Slope intercept form of an equation of a line. m=slope.
In the case of a horizontal line m=0
So, y=b if m=0 irrespective of the value of x.
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Below is the graph of y=mx+2.5 when m=0
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Ed
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{{{graph(500,500,-10,10,-10,10,2.5)}}}