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y = 5x - 4
y = y
x² = 5x - 4
x² - 5x + 4 = 0
D = b² - 4ac
= (-5)² - 4.1.4
= 25 - 16
= 9
Luas = D√D / 6a²
= 9√9 / 6.1²
= 9.3 / 6
= 9/2
= 4 1/2 satuan luas
semoga membantu ya :)