Answer:
a) x + y = 30
2x + 4y = 80
b) chickens - 20
pigs - 10
Explanation:
a) x + y = 30
2x + 4y = 80
b) x + y = 30 (1) times by 2
2x + 4y = 80 (2) times by 1
2x +2y = 60 (1)
2x + 4y = 80 (2)
Take 1 away from 2.
2y = 20
y=10
Substitute it back into the original equations.
x+y=30
x + 10 = 30
x = 20