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Mom said I can spend $150 on my birthday party. The arcade charges $11 per person. How many friends can I invite? Write an equation that could be used to determine the number of friends (f) you could invite to the party.

Respuesta :

1. 150 = cost for number of friends + me

$150 = ($11×f) + $11

Subtracting 11 from both sides:

$139 = $11f

Equation: f = $139/$11

2. Equation: $150 = $11f + $11

150 = 11(f + 1)

Making f the subject: f = (150/ 11) - 1

Based on these equations, f = 12.63`` friends = 12 friends

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