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

A Student Bought A Calculator And A Textbook For A Course In Algebra class=

Sagot :

To solve the system by substitution, first, we substitute the second equation in the first one and get:

[tex]4y+20+y=145.[/tex]

Adding like terms we get:

[tex]5y+20=145.[/tex]

Subtracting 20 from the above equation, we get:

[tex]5y=145-20=125.[/tex]

Dividing by 5, we get:

[tex]y=25.[/tex]

Substituting y=25 in the second equation of the system, we get:

[tex]x=4(25)+20.[/tex]

Simplifying the above result, we get:

[tex]x=100+20=120.[/tex]

Answer:

[tex](120,25)\text{.}[/tex]

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