Question

I'm having trouble with the last one too. Could you explain step by step. thanks.

4c= 3d+3
c= d -1

Answer 1

4c= 3d+3 , but you also told me c = d-1 so..

4(d-1) = 3d+3
4d - 4 = 3d + 3
4d - 3d = 3 + 4
d = 7

sub that back into c=d-1
c = 7-1 = 6