a)
y - 3 = (4 - 3)/(-1-1) (x - 1)
y - 3 = -1/2 (x - 1)
x - 1 = -2y + 6
x + 2y - 7 = 0
b) hAB = dist (C, rAB) = |7 + 2 - 7|/sqrt(1+4) = 2/sqrt(5)
c) S[ABC] = 1/2 AB*hAB = 1/2 sqrt (1^2 + 2*2) * 2/sqrt(5) = 1
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