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y = x² -1
y = x² - 2x - 3
x² -1 = x² -2x - 3
-1 = -2x - 3
2x = -3 +1
2x = -2
x= -1
y = x² -1
y = (-1)² - 1
y = 1 -1
y = 0
HP (x,y)= (-1, 0)
1d. 2y = 9- x²
x + y - 5 = 0 --> y = 5 - x
2y = 9 -x ²
2(5-x) = 9 - x²
10 - 2x = 9 - x²
x² - 2x + 10 - 9 = 0
x² - 2x + 1= 0
(x-1)(x-1) =0
x = 1
y = 5-x
y = 5-(1)
y = 4
HP (x,y) = (1, 4)