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A. m = -a/b = -2/3
B. m = -a/b = -4/5
2x + 3y = 12
a = 2
b = 3
c = 12
m = -a/b
= -2/3
b) 4x + 5y - 20 = 0
4x + 5y = 20
ax + by = c
a = 4
b = 5
c = 20
m = -a/b
= -4/5