A technique used to rewrite a quadratic function in standard form to vertex form

Which graph shows a function with a range of all real numbers greater than or equal to -1

At his new job, jeremiah can choose an hourly rate of $9 plus a $50 weekly bonus for opening the store, or an hourly rate of $10 per hour with no opening bonus. the equations model his salary options. y = 9x + 50 y = 10x

Find the vertex of the function given below y=x^2-6x+1