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y = 3x + 5
y = y
4x² - 4x + 1 = 3x + 5
4x² - 4x - 3x + 1 - 5 = 0
4x² - 7x - 4 = 0
a = 4, b = -7, c = -4
D = b² - 4ac = (-7)² - 4.4.(-4) = 49 + 64 = 113
y + 4x = 3
y = -4x + 3 dan y = x² - x -1
y = y
-4x + 3 = x² - x - 1
0 = x² - x + 4x - 1 - 3
0 = x² + 3x - 4
maka a = 1, b = 3, c = -4
D = b² - 4ac
D = 3² - 4.1. -4
= 9 + 16
= 25