This is solving differential equations by sepeartion of variables

solve for y such that
dy+k(y-70)dx=0
and y(1)=140

show the steps
the problem part for me is i'm stuck trying to seperate them and making the y's go with the dy and everything else go with the dx

show all work
show steps, specifically
1. separating and grouping the y's with dy and x with dx (remember that where c is a constant
2. write the c for the constant
3. subsitute the point (0,140) to solve for c
4. solve for y once you know what c is

show work and answer if you know