Answer:
89
Step-by-step explanation:
 
        
             
        
        
        
Answer:
 

Step-by-step explanation:
Given :
 ...................... equation 1
 ...................... equation 1
 ........................ equation 2
 ........................ equation 2
solving the system of linear equation by substitution method , substitute equation 1 into equation 2 , that is



collect the like terms

therefore :

substitute  into equation 1 to find the value of y , that is
 into equation 1 to find the value of y , that is 


Therefore :


 
        
             
        
        
        
Answer:
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Step-by-step explanation:
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