While at a zoo I saw some flamingos and lions. I counted 96 legs and 35 heads. How many lions did I see at the zoo?
+36916 f= flamingoes 2f = legs f = heads
l = lions 4l = lions l = heads
2f + 4l = 96
f + l = 35 since we are looking for lions, let's eliminate the 'f's Multiply this equation by -2
-2f -2l = -70 and add this to the first equation to get
2l = 26 so l = 13 lions
