math
posted by stef .
write a system of two equation and use them to solve the following problem: two farmers were discussing how many chickens and cows they would purchase at market. the first farmer says to the second, I have just purchased 30 new heads and 100 feet. how many chicken and how many cows did the farmer purchase?

X new chickens
Y new cows.
X + Y = 30
2X + 4Y = 100
2X + 2Y = 60
2Y = 40
Y = 20
X = 30  Y = 10