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A farmer looks into the barnyard at his pigs and chickens and he counts 169 heads and 398 feet how many pigs and chickens are their?
I need an equation PLEASE
 one year ago
 one year ago
A farmer looks into the barnyard at his pigs and chickens and he counts 169 heads and 398 feet how many pigs and chickens are their? I need an equation PLEASE
 one year ago
 one year ago

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ash2326Best ResponseYou've already chosen the best response.0
@PJohnson89 how many legs a chicken has? and a pig?
 one year ago

ashnaBest ResponseYou've already chosen the best response.1
X = Pigs Y = Chickens Total heads (assume 1 per pig and 1 per chicken) = 169 Total legs (assume 4 per pig and 2 per chicken) = 398 X + Y = 169 heads 4X + 2Y = 398 legs You now have two equations with two unknowns, ready to solve. Y = 169  X Substitute for Y 4X + 2(169  X) = 398 4X + 338  2X = 398 2X = 60 X = 30 Pigs now if you still didn't understand .. raise questions ;)
 one year ago

ashnaBest ResponseYou've already chosen the best response.1
@PJohnson89 should i be more clear ?
 one year ago

ashnaBest ResponseYou've already chosen the best response.1
okay .. let x = pigs and y = chickens got it ?
 one year ago

ashnaBest ResponseYou've already chosen the best response.1
in maths we use variables such as x and y , so that doin eqns will be easy or say we can even take for chickens = C and pigs = P if that is what you prefer :)
 one year ago

ashnaBest ResponseYou've already chosen the best response.1
okay .. now chickens = C and pigs = P
 one year ago

ashnaBest ResponseYou've already chosen the best response.1
given that p + c = 169 (head) and 4p+2c = 398 (legs) because head is one for both pig and chicken and leg for a chicken is two and for a pig 4 .. got it ?
 one year ago

ashnaBest ResponseYou've already chosen the best response.1
okay .. good now , Multiply 1st equation by 2 2 P + 2 C = 338 4 P + 2 C = 398 ( CHANGING SIGNS IN THE 2ND EQN) 2P  0 = 60 2P = 60 P = 30 SO MUCH UNDERSTOOD ?
 one year ago

ashnaBest ResponseYou've already chosen the best response.1
@PJohnson89 dealing with a problem ?
 one year ago

PJohnson89Best ResponseYou've already chosen the best response.0
why does the sign change in the second half
 one year ago

ashnaBest ResponseYou've already chosen the best response.1
it is like that .. that is a part of math .. like let me ask you what is 2 * 3 ?
 one year ago

ashnaBest ResponseYou've already chosen the best response.1
yes .. just like that in quadratic eqns sign changes in the second eqn which is universally acceptd .. got it ?
 one year ago

ashnaBest ResponseYou've already chosen the best response.1
can you proceed now ? we have found that pig = 30 now you try doing for chickens ;)
 one year ago

ashnaBest ResponseYou've already chosen the best response.1
do for chicken .. or you want me to do that too ?
 one year ago

PJohnson89Best ResponseYou've already chosen the best response.0
I will try it tomorrow I have to go to work in the morning
 one year ago
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