Answer:
y= -2x
Step-by-step explanation:
The equation of a line is usually written in the form of y=mx+c, where m is the gradient and c is the y-intercept.
Given that the slope is -2, m= -2.
subst. m= -2 into the equation:
y= -2x +c
To find the value of c, substitute a coordinate.
When x= -4, y=8,
8= -2(-4) +c
8= 8 +c (expand)
c= 8-8 (-8 on both sides)
c=0 (simplify)
Thus, the equation of the line is y= -2x.
 
        
             
        
        
        
First picture:
2 and 7 are alternate exterior angles, which when added together need to equal 180 degrees.
Angle 7 = 180 - 146 = 34
Answer is B.34
Second picture:
Angle 8 = 48
Angle 8  + angle 7 = 180
Angle 7 = 180 - 49 =  131
Angle 5 and angle 7 are vertical angle, so angle 5 = angle 7 = 131
Angle 6 is a vertical angle to angle 8 so = 49
Angle 1 = angle 5 = 131
Angle 2 = angle 6 = 49
Angle 3 = angle 7 = 131
Angle 4 = angle 8 = 49
 
        
                    
             
        
        
        
Answer:
A,C,D
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
2) x = 6    y = 7      3) x = -5    y= 2
Step-by-step explanation:
2) 10x - 8y = 4
    2(-5x + 3y = -9)
-10x + 6y = -18
  10x - 8y =   4      Add both equations together
          -2y = -14
          y = 7            Divide both sides by -2
10(x) - 8(7) = 4       Plug in 7 for the y to solve for x
10x - 56 = 4  
      + 56 + 56        Add 56 to both sides
10x = 60 
x = 6                      Divide both sides by 10
3) Where the two lines intersect, that is the solution to x and y. 
The lines intersect at (-5,2). x = -5      y = 2