Question 90429


          Solve the system by substitution.
	x + y = 12
	      y = 2x
           
         x+y = 12.......(1)
           y = 2x.......(2)
        substituting fo y in eq'n (1) we get x+2x = 12 
                                               3x = 12 
                                                x = 12/3 = 4
       substituting for x in eq'n (2) we get y = 2(4) = 8
       The values of x = 4  and y = 8 are the required solutions for the eq'ns