I need help please

Differentiate the function. Then find an equation of the tangent line at the indicated point on the graph of the function. y =f(x) = 1+18-x, (x,y) =(4,3) The derivative of the function y = 1(x) = 1+ 18-x is What is the equation of the tangent line at (4,3)? O A. y- 3=4(X - 4) O B. y - 3 = 7 ( x - 4 ) O C. O D. y-3= -4(X -4) y - 3 = - 7 (x -4)