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Vong grilled 21 burgers at the block party. He grilled the same number of punds of turkey burgers as hamburgers. Each turkey burger weighed 1/4 pund and each hamburger heighed 1/3 pund. How of each did Vong grill?

 Feb 11, 2016
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y4=x3

 

x+y=21

 

Mutiply by 3 on both sides. 

 

x=3y4

 

and x+y=21

 

So, substitute 3y4

for x.

 

So, then y+3y/4=21

 

Multiply all terms by 4.

 

4y+3y=84

 

7y=84

 

Divide by 7.

 

y=12

 Feb 11, 2016

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