Question 663838
Find the slope-intercept equation of the line that has the given characteristics slope=0 and y-intercept (0,4). 
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equation of a line: y=mx+b, m=slope, b=y-intercept
slope,m=0 and y-intercept (0,4)  means this is a horizontal line that crosses the y-axis at 4.
so, y=mx+b becomes y=b or y=4 which is the equation of given line.