Answer:
x = -7
Step-by-step explanation:
First we find the slope using
m = ( y2-y1)/(x2-x1)
    = ( -8 - 5)/( -7 - -7)
    = (-8-5)/(-7+7)
    = -13/0
This means the slope is undefined and the line is vertical
Vertical lines are in the form
x= constant and the constant is the x value of the points
x = -7
 
        
             
        
        
        
Answer:
positve and negative i think
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
y^3+27
Step-by-step explanation:

*use box method
 
        
             
        
        
        
Neither of the options are correct for the given equations. 
Step-by-step explanation:
-x+y=4...................................................1
16x+y=-3...............................................2
Subtract equation 1 and 2
                               -x+y- 16x -y = 4+3
                                ⇒ -17x = 7
                                ⇒x=  
 
                                ⇒x= -0.4117
so,
                         16×-0.4417 + y = -3
                        ⇒y= -3+6.5872
                        ⇒y= 3.5872
So the point of intersection is (-0.4117, 3.5872)
 
        
             
        
        
        
Answer:
r = - 6
Step-by-step explanation:
Given
6r + 7 = 13 + 7r ( collect terms in r on the left and numbers on the right )
Subtract 7r from both sides
- r + 7 = 13 ( subtract 7 from both sides )
- r = 6 ( multiply both sides by - 1 )
r = - 6