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This equation shows how the cost of Haley's birthday party depends on the number of guests. $\newline$ $c = g + 8$ $\newline$ The variable $g$ represents the number of guests, and the variable $c$ represents the cost in dollars. If there are $8$ guests, how much will Haley'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 Haley's birthday party depends on the number of guests.

\newline

c = g + 8

\newline

The variable

g

represents the number of guests, and the variable

c

represents the cost in dollars. If there are

8

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

\newline

\$

\_\_\_\_

Identify Variable: Identify the variable that $8$ guests correspond to? $g$ represents the number of guests. So, $8$ guests gives the value for $g$ .
Substitute Value: We know that $g = 8$ . Plug in the value for $g$ in $c = g + 8$ . $c = g + 8$ Substitute $g$ with $8$ . $c = 8 + 8$
Solve for Cost: $c = 8 + 8$ . Solve for $c$ . $c = g + 8$ $c = 8 + 8 = 16$ Therefore, the cost of Haley's birthday party with $8$ guests will be $\$16$ .

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