Answer:
3x−4y=9 −3x+2y=9 
Add these equations to eliminate x: −2y=18 
Then solve−2y=18
for y: −2y=18 −2y −2 = 18 −2 (Divide both sides by -2) 
y=−9 
Now that we've found y let's plug it back in to solve for x. 
Write down an original equation: 3x−4y=9 
Substitute−9for y in 3x−4y=9: 3x−(4)(−9)=9 
3x+36=9(Simplify both sides of the equation) 
3x+36+−36=9+−36(Add -36 to both sides) 
3x=−27 3x 3 = −27 3 (Divide both sides by 3) x=−9 
Answer: x=−9 and y=−9
Hope This Helps!!!
 
        
             
        
        
        
Answer:
90 degrees, 60 degrees and 30 degrees
Step-by-step explanation:
90/3 = 30
30 x 2 = 60 
 
        
             
        
        
        
Answer:
Commutative property
Step-by-step explanation:
Hope that helps!
 
        
             
        
        
        
Answer:
.20
Step-by-step explanation:
75/500 = .15 
35-15=20
 
        
             
        
        
        
I hope this helps, i got it from a cheat sheet online