Proper equation

Question

What is the proper steps to determine the right answer to: I have a total of 20 animals and a total of 46 feet, how many 2 legged and how many 4 legged animals must I have?

Answer 1

n = number with 4 legs

m = number with 2 legs

You need to solve this system of equations in two unknowns n and m:

n + m = 20 (total number of animals)

4n + 2n = 46 (total number of feet)

Now proceed to solve by elimination, substitution, matrix methods, or Cramer's rule. Can you finish from here?