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Use the equation $d = q + 9$ to find the value of $d$ when $q = 10$ . $\newline$ $d =$ ____

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Find a value using two-variable equations

Full solution

Q. Use the equation

d = q + 9

to find the value of

d

when

q = 10

.

\newline

d =

____

Substitute $q$ with $10$ : Step $1$ : We know that $q = 10$ . $\newline$ Plug in the value for $q$ in $d = q + 9$ . $\newline$ $d = q + 9$ $\newline$ Substitute $q$ with $10$ . $\newline$ $d = 10 + 9$
Solve for d: Step $2$ : $d = 10 + 9$ . $\newline$ Solve for d. $\newline$ $d = 10 + 9 = 19$ .

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