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1. m = (y2 - y1) / (x2 - x1)
1 = (3 - 9) / (2a - 5a)
1 = (-6) / (-3a)
1 × (-3a) = -6
-3a = -6
a = 2
2. m = (y2 - y1)/(x2 - x1)
m = -3 = (8-5 )/ (2b - 4b)
-3 ( -2b) = 3
b = 1/2