(-1, 4)
Step-by-step explanation:
2x+5(-3x+1)=18
2x-15x+5=18
-13x+5=18
-13x=13
x=-1
-3(-1)+1
3+1
y=4
he has 140 chickens because he has 10 times more chickens than ducks and he has 14 ducks so 14*10=140