Question

me ajudem rapido urgente agora com conta

Answer 1

Resposta:

A(1,-1), B(-1,4) , C(0,y)

triângulo isósceles

dAB²=(1+1)²+(-1-4)²=4+25 ==>dAB=√29  é a base

dAC²=(1-0)²+(-1-y)²

dBC²=(-1-0)²+(4-y)²

(1-0)²+(-1-y)² = (-1-0)²+(4-y)²

(-1-y)² = (4-y)²

1+2y+y²=16-8y+y²

2y=15-8y

10y=15

y=3/2  ==> C=(0,3/2)