+70 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?
+5265 \({y \over4} = {x \over 3}\)
x+y=21
Mutiply by 3 on both sides.
\(x = {3y \over4}\)
and x+y=21
So, substitute \({3y \over4}\)
for x.
So, then y+3y/4=21
Multiply all terms by 4.
4y+3y=84
7y=84
Divide by 7.
y=12
