Hello everyone

How would i solve the following

Find an equation for the tangent line to the graph of x+sin(y-2x)=1 at the point (1,2)

I did

1+cos(y-2x)(dy/dx)(-2)=0

then I did cos(y-2x)(dy/dx)=2

(dy)/(dx)=(2)/(cos(y-2x) so would I just plug in the value of x and y.