Math problem solved by Graphing, Substitution, and Elimination

Question

Hi, the question is "A flying saucer filled with space aliens landed in my back yard! After the entire crew had filled out of the spaceship, I happened to count their heads and feet, I saw a total of 88 heads and 120 feet. The space aliens each had 2 heads, the green aliens had two feet and the blue aliens each had three feet. How many of each type of creature landed in my yard

I need this done in Graphing, Substitution, and Elimination, and if you could show me the steps for the answers in each way that would be very helpful

Answer 1

In the graph section, I meant to say, "We can conclude that B = 32" rather than "y = 32".