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This equation shows how the cost of Tanner's birthday party depends on the number of guests. $\newline$ $c = g + 12$ $\newline$ The variable $g$ represents the number of guests, and the variable $c$ represents the cost in dollars. If there are $7$ guests, how much will Tanner's birthday party cost? $\newline$ $\$$ _____

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Find a value using two-variable equations: word problems

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Q. This equation shows how the cost of Tanner's birthday party depends on the number of guests.

\newline

c = g + 12

\newline

The variable

g

represents the number of guests, and the variable

c

represents the cost in dollars. If there are

7

guests, how much will Tanner's birthday party cost?

\newline

\$

_____

Identify guests: question_prompt: How much will Tanner's birthday party cost with $7$ guests?
Plug in value: Step $1$ : Identify the value for $g$ . Since there are $7$ guests, $g = 7$ .
Calculate cost: Step $2$ : Plug in the value for $g$ into the equation $c = g + 12$ . So, $c = 7 + 12$ .
Check math: Step $3$ : Calculate the cost. $c = 7 + 12 = 19$ .
Check math: Step $3$ : Calculate the cost. $c = 7 + 12 = 19$ . Step $4$ : Check the math. $7$ guests plus the base cost of $12$ dollars equals $19$ dollars, so no math error.

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