A student bought a calculator and a textbook for a course in algebra.

boitshupoO

boitshupoO

Answered question

2021-08-12

A student bought a calculator and a textbook for a course in algebra. He told his friend that the total cost was $145(without tax) and that the calculator cost $20 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=145x=4y+20
Solve the system by using the method of substitution and enter the ordered pair.

Answer & Explanation

Tasneem Almond

Tasneem Almond

Skilled2021-08-13Added 91 answers

(4y+20)+y=145 
5y=14520 
5y=125 
y=1255=25 
x=4×25+20 =120 

 

So
(x,y)=$(120,25)

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