Nutrition A glass of skim milk supplies $0.1 \mathrm{mg}$ of iron and $8.5 \mathrm{~g}$ of protein. A quarter pound of lean red meat provides $3.4 \mathrm{mg}$ of iron and $22 \mathrm{~g}$ of protein. If a person on a special diet is to have $7.15 \mathrm{mg}$ of iron and $73.75 \mathrm{~g}$ of protein, how many glasses of skim milk and how many quarter-pound servings of meat would provide this? was $\$ 100,000$ and his total yearly interest payment was $\$ 10,900$, how much did he borrow from the bank?

Determine whether the following pairs of equations represent parallel lines, perpendicular lines, or neither.

$$6 x-4 y=12 ; \quad 3 x-2 y=6$$

Nutrition Each ounce of substance A supplies $5\%$ of the nutrition a patient needs. Substance B supplies $12 \%$ of the required nutrition per ounce. If digestive restrictions require that the ratio of substance $A$ to substance $B$ be $3 / 5$, how many ounces of each should be in the diet to provide $100 \%$ of the required nutrition?