Marie and her 4 friends went to the country to on her uncle robert's farm. marie said she saw 100 chickens and cows. her friend said she counted 252 legs. how many chicken and how many cows did they see

1. ∠1 is complementary to ∠2 and ∠3 is complementary to ∠2. subtraction property of equality 2. m∠1 + m∠2 = 90 and m∠3 + m∠2 = 90 substitution 3. m∠1 + m∠2 = m∠3 + m∠2 definition of complementary 4. m∠1 = m∠3 given