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john paid $34 for 2 algebra books and three geometry books. he paid $36 for 3 algebra and two geometry books. cost for each book?

 Dec 18, 2015

Best Answer 

 #4
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WOW Hayley! You answer that question in less than 3 minutes!

 

You get the right answer too. hahaha

 Dec 18, 2015
 #1
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Algebra book cost x
geometry book cost y 
2x+3y=34
3y=-2x+34
y=(-2/3)x+34/3 
3x+2y=36 
substitute y in the equation 

3x+2((-2/3)x+34/3)=36 
3x-(4/3) x +68/3=36 
multiply equation by 3 
9x-4x+68=108
5x=40
x=8 , algebra book cost 
plug x in equation 2x+3y=34 to get y=6

 

Was I helpful at all? (:

 Dec 18, 2015
 #2
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yess ty but i ran out of time for the test we were taking :(

 Dec 18, 2015
edited by Guest  Dec 18, 2015
edited by Guest  Dec 18, 2015
 #3
avatar+8581 
0

Aww, I'm sorry!!!

 Dec 18, 2015
 #4
avatar+1315 
+5
Best Answer

WOW Hayley! You answer that question in less than 3 minutes!

 

You get the right answer too. hahaha

Dragonlance Dec 18, 2015
 #5
avatar+8581 
0

:) hehe

 Dec 18, 2015

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