Algebra II Exercises: Solving Linear Systems by Graphing

A farmer has 125 pens for his cows and pigs. One pen can hold either one cow or two pigs. It costs $8 a day to care for a cow and only$3 to care for 2 pigs. He has $130 a day to care for all of his animals. What combination of cows and pigs will give him the most animals but still fit in his budget and on his farm?