Answer:
Step-by-step explanation:
to solve this system of equations we will add them
 x-3y=-12
2x+3y=3 now +3y-3y=0
3x=-12+3
3x=-9
x=-3
plug in the first equation
-3-3y=-12
-3y=-12+3
-3y=-9
y=3
 
        
             
        
        
        
Answer:
= 40
Step-by-step explanation:
2 ( 3 (5 + 2) -1)
= 2 * 20
= 40
 
        
                    
             
        
        
        
Answer:
1st option
Step-by-step explanation:
Given y varies inversely as x then the equation relating them is
y =  ← k is the constant of variation
 ← k is the constant of variation
To find k use (3, 8 ) , that is x = 3 when y = 8 , then
8 =  ( multiply both sides by 3 )
 ( multiply both sides by 3 )
24 = k
y =  ← equation of variation
 ← equation of variation
 
        
             
        
        
        
Answer: Yes, they are proportional
Step-by-step explanation:
Simplify both to lowest number 
12/16 = 3/4
30/40 = 3/4 
 
        
                    
             
        
        
        
False unless they are either both 1 or both 0.
11ab=11(a+b) not 5a+6b
Hope this helps :)