If the straight line ax + by + c = 0 always passes through (1, -2), then a, b, c are in
The line \( ax + by + c = 0 \) passes through the point \( (1, -2) \). Substituting the point into the equation: \[ a(1) + b(-2) + c = 0 \] \[ a - 2b + c = 0 \] Rewriting: \[ a + c = 2b \] Thus, \( a \), \( b \), and \( c \) are in arithmetic progression (A.P.).
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