Answer:
8y = -6
Step-by-step explanation:
Simply add the equations as you would numbers.
The 'x's cancel each other out. The 'y's add together as normal numbers. 
9 + (-15) = -6
Hope that this helps!
 
        
             
        
        
        
Answer: 131.1287 square mm (approx)
Step-by-step explanation:
The area of a triangle,
 
Where  and
 and  are adjacent sides and
 are adjacent sides and  is the include angle of these sides,
 is the include angle of these sides,
Here PR and QR are adjacent sides and ∠R is the included angle of these sides,
Thus, we can write,
 ,
,  and
 and  ,
,
Thus, the area of the triangle PQR,


 
        
             
        
        
        
Answer:
SOLVE FOR Y 
graph y= 2x + 2 
sp graph the points 
(0,2) and then (1,4) 
connect the points and extend the line. 
Step-by-step explanation:
add 2x to both sides 
-2x+y=2 
+2x     +2x 
y= 2+2x 
reverse 
y= 2x+2 
 
        
             
        
        
        
Answer:
r = t - u - s
Step-by-step explanation:
To solve for r in terms of s, t, and u, means to have r on one side and have t, u, and s.
t = u - s + r
t - u = s + r
t - u - s = r
 
        
             
        
        
        
Answer:
4. AB=4
Step-by-step explanation:
Transitive property is like substitution, or that's how I like to think of it. Since we have 2 common variables and 2 equations, we can "link them together". Replacing x with 4, you get AB=4.