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Verified answer
SPLKDVy = -x² + 2x + 4
x + y = 4 , y = 4 - x
maka
4 - x = -x² + 2x + 4
x² - 3x = 0
x(x - 3) = 0
x = 0 atau x = 2
Untuk x = 0
y = 4 - 0
y = 0
Untuk x = 2
y = 4 - 2
y = 2
HP : {(2 , 2) , (0 , 4)}