Practice problem
Let yyy vary jointly with xxx and zzz. If y=12y=\frac12y=21 when x=13x=\frac13x=31 and z=11z=11z=11, what is yyy when x=43x=\frac43x=34 and z=9z=9z=9?
229\frac{22}{9}922
1811\frac{18}{11}1118
188\frac{1}{88}881
322\frac{3}{22}223
Type a concept, like “slope” or “photosynthesis”.
