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caranya :
ax + by + c = 0
m = - x / y
a.
2x + 3y -5 = 0
m= -x / y
m = -2/3
b.
y - x + 2 = 0
m = - x/ y
m= -(- 1/ 1
m = 1
c.
4x - 8y - 16 = 0
m = - x / y
m = -4 / -8
m= 1/2