A slope of- 2 passsing through the point (-11,17)

I assume you want an equation of a line, here......we can use the point-slope form and transform it into the slope-intercept form

y - 17 = -2(x - [-11] )   add 17 to both sides   and simplify the right side

y =  -2x - 22  + 17

y = -2x - 5