Question 274935
c-5d=-2

c=5d-2


7c+5d=18

7(5d-2)+5d=18

35d-14+5d=18

40d=32

d=32/40

d=4/5

c=5d-2=5(4/5)-2=4-2=2


Answers: c=2, d=4/5