Question

10c-f=-13=cd solve for c. show work please

Answer 1

10c - f = -13 = cd

set up 2 equations

10c - f = -13 and -13 = cd

solve one at a time:
10c - f = -13
10c = -13 +f
c = (-13 + f) / 10

-13 = cd
-13/d = c

Answer 2

c = (-13 + f) / 10
and
c = -13/d

so it can also be said that

(-13 + f) / 10 = -13/d