4.2x - 1.4y = 2.1    |multiply both sides by 10
42x - 14y = 21    |subtract 42x from both sides
-14y = 21 - 42x    |change signs
14y = 42x - 21    |divide both sides by 14
y = 3x - 1.5
        
             
        
        
        
Answer:
C.
Step-by-step explanation:
Adding 2 fractions results in a fraction.
 
        
                    
             
        
        
        
Answer:
4/3
Step-by-step explanation:
-3y + 4x = -6
-3y = -6 -4y
slove for Y
 y = -6/-3 -4/-3 x
Y = -2 +4/3x
Y = 4/3 x -2 
Y = 4/3 x -2 
so slope or gradient is coefficient of x
4/3 is gradient.
 
        
                    
             
        
        
        
I got 200 from a octagon with the diameter of 10
        
             
        
        
        
Answer:
33
Step-by-step explanation: