<PRE><B>Question 30503</B>
Set up the points: (12,400 , 341,000) and (86,000 , 265,000)
Find the slope: (y2 - y1)/ (x2 - x1)
(265000-341000) / (86000-12400) = 20

Use the equation y=mx+b: y = 20x + b
Put a point in for x and y: 265000 = 20(8600) + b
Now solve for b: 265000=172000 + b
Subtract 172000 from both sides to get: 93000 = b

The equation would be : y = 20x + 93,000

To predict the sales when 10,000 is spent on advertisements, substitute 10,000 in for x: y = 20(10000) + 93000 = 293000

The predicted sales would be: $293,000</PRE>