linear function

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noun
  1. 1

    (mathematics) Any function whose graph is a straight line: f(x)=ax+b

  2. 2

    (mathematics) Any function whose value on the sum of two elements is the sum of the values of the function on the two elements and whose value on the product of a scalar times an element is the scalar times the value of the function on the element: f(ax+by)=af(x)+bf(y)