Developmental norms are used as a benchmark to determine where one should be developmentally. Please select the best answer from
2 answers:
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1. 
and x+y=6
2. x^2+y^2 and x+y remind us of the formula:
substituting we get:
2xy=36-28
xy=8/2=4
3 Let's solve the system of equations i)x+y=6 and ii)xy=4
substitute y=4/x in (i):
multiply all sides by x:
complete the square:
or 
or 
so from x+y=6, y=6-x
case 1, gives 
case 2, gives 
Answer:
, 
2. x^2+y^2 and x+y remind us of the formula:
substituting we get:
2xy=36-28
xy=8/2=4
3 Let's solve the system of equations i)x+y=6 and ii)xy=4
substitute y=4/x in (i):
multiply all sides by x:
complete the square:
so from x+y=6, y=6-x
case 1,
case 2,
Answer: