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y = mx - 14
y = y
2x² + 5x - 12 = mx - 14
2x² + 5x - mx - 12 + 14 = 0
2x² + (5 -m)x + 2 = 0
a = 2
b = 5 - m
c = 2
syarat D > 0
b² - 4ac > 0
(5 - m)² - 4.2.2 > 0
25 - 10m + m² - 16 > 0
m² - 10m + 9 > 0
(m - 1)(m - 9) > 0
+++ - - - - - - +++
--------o-------------o----------
1 9
m < 1 atau m > 9