Math  /  Algebra

QuestionUse the equation d=s+9d=s+9 to find the value of dd when s=10s=10. d=d=

Studdy Solution

STEP 1

What is this asking? If dd equals ss plus 9, and ss is 10, what's the value of dd? Watch out! Make sure you substitute the correct value for ss and don't mix up addition and multiplication!

STEP 2

1. Substitute
2. Calculate

STEP 3

We're given the equation d=s+9d = s + 9.
This tells us how dd relates to ss.
We're also told that s=10s = 10.
Our mission is to find dd!

STEP 4

Let's **substitute** the value of ss into the equation.
Everywhere we see an ss, we'll replace it with **10**.
So, d=s+9d = s + 9 becomes d=10+9d = 10 + 9.
See how we swapped the ss for **10**?
This is because they're equal!

STEP 5

Now we have d=10+9d = 10 + 9.
This is much simpler!
We just need to perform the addition.

STEP 6

10+9=1910 + 9 = 19.
So, d=19d = 19!
We found it!

STEP 7

When s=10s = 10, the value of dd is **19**.

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