How I got my answer before was substitution! 
        
             
        
        
        
Step-by-step explanation:
x = -10, y = 10
y= -4x+4
m1×m2 = -1
-4 × m2 = -1
m2 = 1/4
y-y1 = m(x-x1)
y-10 = 1/4(x+10)
y-10 = 1/4x +10/4
(×4)
4y-40=x+10
4y=x+50
x-4y+50=0
 
        
             
        
        
        
Answer:
A
Step-by-step explanation:
 
        
                    
             
        
        
        
218.3 is the answer for this one