The relationship between \( a \) and \( b \) for the continuity of the function
\( f(x) = \begin{cases} ax + 1, & x \leq 3 \\ bx + 3, & x \gt 3 \end{cases} \)
at \( x = 3 \) is __________.
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For piecewise functions, continuity at a point means left limit equals right limitAlways equate both expressions at that point.