To find the equation of a line using two given set of points, you must first find slope. To do so, we must use the slope formula:
y2 - y1 / x2 - x1 
In this case:
1 - 9 / -1 - 3 = -8 / -4 
- 8 / -4 = 2 (simplified) 
Now we can use the point-slope formula:
y - y1 = m(x - x1) 
y - 1 = 2(x + 1 )
y - 1 = 2x + 2
y = 2x + 3
In order to make 3x - y = 6 in slope intercept form, we must isolate y.
- y = -3x + 6
Note: y cannot be negative, so we'll multiply both sides by -1 
( -1 ) - y = - 3x + 6 ( -1 ) = y = 3x -6
        
                    
             
        
        
        
Answer: -4
The formula for slope is rise/run. This means that between two points, you have to see the distance going up and down/ left and right. 
Looking at points (0,-1) and (3,-1), you can see that the height difference is 4 units. This means that the rise is 4. 
rise/run
4/run
Left and right, the difference is only one unit. 
4/run
4/1
4
This graph is also negative, so let’s add that in. 
-4
This is your answer! I know it wasn’t one of the options you provided, but I’m pretty sure that this is the answer. 
Hope this helps comment below for more questions :)
        
             
        
        
        
KE=1/2(m)(v)^2 
KE=1/2(80)(1.5)^2
KE=90 J
        
             
        
        
        
You do 27x27 and get 729 is going to be your answer