Draw the image of y = 3x-6 when - 1 ≤ X

Draw the image of y = 3x-6 when - 1 ≤ X

Substituting x = - 1 and x = 3 into y = 3x-6, we get y = - 9 and 3, so the value range of function value y is - 9 ≤ y