SOLUTION: A student bought a calculator and a textbook for a course in algebra. He told his friend that the total cost was $135 (without tax) and that the calculator cost $15 more than four

Question 1197758: A student bought a calculator and a textbook for a course in algebra. He told his friend that the total cost was $135 (without tax) and that the calculator cost $15 more than four times 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=135x=4y+15. Solve the system by using the method of substitution.
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
The corresponding modeling system is
.......eq..1
......eq.2
_________________________
.......eq..1, substitute from eq.2
.....solve for

go to
......eq.2, substitute value

$= the cost of a calculator and $= the cost of the textbook

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