Question 53924
Let the coordinates for last month(x1,y1)=(-1,4000)
Let the coordinates for this month (x2,y2)=(0,5000)
Notice that (0,5000) is the y intercept (0,b).
All we need to find is the slope (m).
The slope formula is:
{{{m=(y2-y1)/(x2-x1)}}}
{{{m=(5000-4000)/(0-(-1))}}}
{{{m=1000/1}}}
m=1000
The slope intercept form of a line is:
y=mx+b, where m=slope, and (0,b)= y intersept.
Therefore the equation is:
y=1000x+5000
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In four months x=4, substitute that into the equation for x and solve for y.  Remember y is how much sales they think thy're going to make if this trend continues.
y=1000(4)+5000
y=4000+5000
y=9000
y=9000.00
Happy Calculating!!!!