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You have 38 animals with a total of 68 legs. Some have 2 legs and some have 4. What is the equation you use to work out how many 2 legged and 4 legged animals there are?
x = nr. of animals with 2 legs ; y = nr. of animals with 4 legs; We have x+ y = 38 and 2x + 4y = 68 ; Then x = 38 - y ; 2( 38 - y) + 4y = 68 ; 76 - 2y + 4y = 68 ; 2y = - 8 ; y = - 4 False, because y > 0 ;
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