Question 630034
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
The cost for an exterminator to treat a 1500 sq ft home is $65.00 and the cost for a 3000 sq ft home is $80.00. 
 (3000, 80)
 (1500, 65) Slope m = 15/1500 = 1/100
In general:  y = mx + b
{{{C = (1/100)*A + b }}}   || Where C is the Cost and A the area of the home
{{{80 = (1/100)*3000 + b}}}   |Using (3000,80) to solve for b
80 = 30 + b
50 = b, the y-intercept
{{{C = (1/100)*A + 50}}}
C = {{{(1/100)*2100 + 50}}}= $71