Question

A student bought a calculator and a textbook for a course in algebra. He told his friend that the total cost was $170 (without tax) and that the calculator cost $20 more than twice the cost of the textbook. What was the cost of each item? Let $x$ = the cost of a calculator and $y$ = the cost of the textbook. The corresponding modeling system is \begin{cases} x + y = 170 \\ x = 2y + 20 \end{cases}. Solve the system by using the method of substitution.

          A student bought a calculator and a textbook for a course in algebra. He told his friend that the total cost was $170 (without tax) and that the calculator cost $20 more than twice the cost of the textbook. What was the cost of each item? Let $x$ = the cost of a calculator and $y$ = the cost of the textbook. The corresponding modeling system is \begin{cases} x + y = 170 \\ x = 2y + 20 \end{cases}. Solve the system by using the method of substitution.

A student bought a calculator and a textbook for a course in algebra. He told his friend that the total cost was 170 (without tax) and that the calculator cost20 more than twice the cost of the textbook. What was the cost of each item? Let x = the cost of a calculator and y = the cost of the textbook. The corresponding modeling system is x + y = 170
x = 2y + 20 . Solve the system by using the method of substitution.

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University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Lien Le

05/22/2023

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01:08:14 A student bought a calculator and a textbook for a course in algebra. He told his friend that the total cost was $170 (without tax) and that the calculator cost $20 more than twice the cost of the textbook. What was the cost of item? Let x= the cost of a calculator and y= the cost of the textbook. The corresponding modeling system is x+y=170 x=2y+20. Solve the system by using the method of substitution. x=2y+20 x+y=170 . Solve the system by using the method of substitution. item? Let x = the cost of a calculator and y = the cost of the textbook. The corresponding modeling system is (without tax) and that the calculator cost $20 more than twice the cost of the textbook. What was the cost of each 01:08:14