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| PAGE: 146 | SET: Exercises | PROBLEM: 1 |
Let 
be the number of T-shirts.
Let 
be the number of hats.
Observe the table:
The cost and sale price of each item is shown.
The boosters spend a total of 
on T-shirts and hats.
The total selling price on T-shirts and hats make 
.
Find how many T-shirts did they sell.
Cost price: 
.
Sales price: 
.
The system of equations is and .
Solve the equations and find the value.
(Cost price)
(Subtract 
from each side)
(Apply additive inverse property: 
)
(Divide each side by 
)
(Divide each side by 
)
Find the value.
(Sales price)
(Substitute 
)
(Distributive property: 
)
(Subtract 
from each side)
(Apply additive inverse property: )
(Multiply each side by 
)
(Multiply)
Therefore, they sold 
T-shirts.
They sold 
T-shirts.
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