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vamos la

o ponto P=(-6, y) e Q=(1,3)

distPQ²=(1-(-6))²+(3-y)²

(V74)²= 7²+9-6y+y²

74= 49+9-6y+y²

y²-6y+58-74=0

y²-6y-16=0

delta= 36+64= 100

y=(6+-10)/2

y'= 8

y''= -2

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P1=(-6,8)

P2= (-6,-2) okkkkkk

P(-6,y)

Q(1,3)

dPQ² = (Px - Qx)² + (Py - Qy)²

dPQ² = (-6 - 1)² + (y - 3)²

dPQ² = 49 + y² - 6y + 9 = y² - 6y + 58

y² - 6y + 58 = 74

y² - 6y - 16 = 0

(y - 8)*(y + 2) = 0

y1 = 8

y2 = -2

P1(-6,8)

P2(-6,-2)

pronto