$\"\"$

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(a)

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Let the cost price of T - shirt is x and the cost price of jeans y.

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Salazar bought 4 T - shirts and 3 pairs of jeans for 181 dollars, then the equation is $\"\"$ .

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Jenna bought 1 T - shirts and 2 pairs of jeans for 94 dollars, then the equation is $\"\"$ .

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The system of equations are $\"\"$ .

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(b)

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Observe the coefficient of each term, the coefficient of x - term is one in the second equation, so the best method is substitution method to solve the system of equations. $\"\"$

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(c)

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Substitution method:

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Equation 1: $\"\"$

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Equation 2: $\"\"$ .

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Solve the second equation, $\"\"$ for x since the coefficient is 1.

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Subtract 4y from each side

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$\"\"$

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$\"\"$

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$\"\"$

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The value of $\"\"$ substitute in the first equation, $\"\"$ to find y.

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$\"\"$

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$\"\"$

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$\"\"$

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Subtract 376 from each side.

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$\"\"$

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$\"\"$

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Divide each side by negative 10.

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$\"\"$

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$\"\"$

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$\"\"$

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The value of $\"\"$ substitute in the either equation to find x.

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Equation 1: $\"\"$

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$\"\"$

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$\"\"$

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Subtract 117 from each side.

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$\"\"$

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$\"\"$

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Divide each side by 4. \ \

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$\"\"$

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$\"\"$

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$\"\"$

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The solution are

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(a) $\"\"$

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(b)Observe the coefficient of each term, the coefficient of x - term is one in the second equation, so the best method is substitution method to solve the system of equations.

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(c) $\"\"$ .