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allochka39001 [22]
3 years ago
13

A shop sells a party hat at x dollars and a mask at y dollars. On a particular morning, 3 hats and 4 masks were sold for $27. In

the afternoon, 3 hats and 6 masks were sold for $33. Find the cost of each hat and each mask.
Mathematics
1 answer:
Aleks [24]3 years ago
5 0

Answer:

Cost of each hat: $5

Cost of each mask: $3

Step-by-step explanation:

Let be "x" the cost in dollars of a party hat and "y" the cost in dollars of a mask.

Set up a System of equations using the information given in the exercise:

\left \{ {{3x+4y=27} \atop {3x+6y=33}} \right.

You can use the Elimination Method to solve this System of equations:

1. You can multiply the first equation by -1.

2. Then you must add the equations.

3. Solve for "y".

Then:

\left \{ {{-3x-4y=-27} \atop {3x+6y=33}} \right.\\.....................\\2y=6\\\\y=\frac{6}{2}\\\\y=3

4. Now you can substitute the value of "y" into any original equation.

5. Finally, solve for "x" in order to find its value.

Then:

 3x+4(3)=27\\\\3x=27-12\\\\x=\frac{15}{3}\\\\x=5

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