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y=8x
------------ -
0=4x²-8x
(4x-8)(4x-0)
x=2
y=8x
y=8.2
y=16
3. y=8x-x²
y=2x
------------- -
0=6x-x²
x=6
y=2x
y=12
4. y=x²-5
y=4x
------------- -
0=x²-4x-5
x=5
y=4x
y=20
5.y=1-3x
y=x²-2x+1
------------------- -
0=-x²-x
x=-1
y=1-3x
y=4
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