Question

If

C
=
s
−
5
C=s−5 and
D
=
s
−
8
,
D=s−8, find an expression that equals
C
+
2
D
C+2D in standard form.

Answer 1

9514 1404 393

Answer:

C +2D = 3s -21

Explanation:

Use the substitution property of equality.

C = s -5

D = s -8

Then the value of your expression is ...

C +2D = (s -5) +2(s -8)

= s -5 +2s -16

C +2D = 3s -21