9.920 is the answer to your question
Y= f(x)= ax+b
when x= -1, y= -1
-1= -a+b | * ( -1)
when x= -3, y=2
2= -3a+b
-3a+b= 2
a - b= 1
--------------
2a=3
a=3/2 is the slope
A^2 + b^2 = c^2
(500)^2 + (1200)^2 = c^2
1,690,000 = c^2
take the square root of 1,690,000
Answer is 1,300 feet
<h3>Answer:</h3>
The Slope is 
<h2>Explanation:</h2>
Notice that both the points, 
and 
, are on the line. So we can use those points to calculate the slope. Recall that that slope of the line 
can be calculated by 
if we have the points, 
and 
.
<h3>Calculating for the slope of the line:</h3>
Given:
