Question 160171
Find an equation of the line having the given slope and containing the given point. Express your answer in the form y=b or y=mx+b. 
m=0, (0,-3) 
The equation of the line y= ________
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A slope of 0 means it's horizontal, parallel to the x-axis.
It passes thru (0,-3), so y = -3 for any value of x.
That's the equation, y = -3.