y= (x-2)^2+4 ....(1)
Solve for y from (2) divided by 2:
Substitute (2a) in (1)
7-2x = (x-2)^2+4
7-2x = x^2-4x+4+4
x^2 -2x +1 = 0 ....(1a)
Solve 1(a) to get:
x=1 (duplicity 2)
Now substitute x=1 in (2a) to get
Substitute x=1,y=5 in (1) to check:
(1-2)^2+4 = 5 OK.
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