To determine if the relation \( y = 4x - 1 \) is a function, we can analyze the equation and apply the vertical line test.
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Graph the relation: The equation \( y = 4x - 1 \) is a linear equation, which will produce a straight line when graphed. The slope is 4 and the y-intercept is -1.
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Vertical Line Test: The vertical line test states that if any vertical line intersects the graph of the relation at more than one point, then the relation is not a function.
Since \( y = 4x - 1 \) is a straight line, any vertical line drawn will intersect it at exactly one point.
Therefore, by the vertical line test, the relation \( y = 4x - 1 \) is a function.
So the answer is \( 1 \).