Complete the square for x and y.
7x^2 + 3y^2 - 28x - 12y = -19
7x^2 - 28x + 3y^2 - 12y = -19
7(x^2 - 4x) + 3(y^2 - 4y) = -19
7(x^2 - 4x + 4) + 3(y^2 - 4y + 4) = -19 + 28 + 12
7(x - 2)^2 + 3(y - 2)^2 = 21
 
 
        
        
        
Answer:
In afternoon it was -2 degree cold. At night it went 5 time colder. How cold was it at night?
Step-by-step explanation:
 
        
             
        
        
        
The answer is x=4 and y=-4
        
             
        
        
        
In order to solve this problem, we need to figure out what percent 2,430 is of 56,000.  We do this by dividing 2,430 by 56,000.  This is equal to 0.04339.  We multiply this by 100 to get a percent.  This is equal to 4.339%, so the tax rate is 4.339%.
        
                    
             
        
        
        
Answer:
a). y = 4.5
b) Scale factor = 
Step-by-step explanation:
a). Since, polygon Q is the scaled copy of polygon P
     Both the figures will be similar.
     Therefore, their corresponding sides will be proportional.
     
     If x = 6,
     
     y = 
     y = 4.5
b). Since, polygon Q is the scaled copy of polygon P,
     Polygon Q will be the image of preimage polygon P. 
     Scale factor = 
                          = 