Mathematics Triangles

If the points A(-3, 9), B(a, b) and C(4, -5) are collinear and a + b = 1, then the values of a and b are:

1
a = 2, b = 1
2
a = 2, b = -1
3
a = -2, b = 1
4
a = -2, b = -1
5
Not Attempted

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