Need quick plz

a rectangle has vertices at these coordinates.

(1, 7), (1, 3), (9, 3)

what are the coordinates of the fourth vertex of the rectangle?

enter the coordinates in the boxes.
(
,
)

For the equation below, x is the input and y is the output. y = -4x + 3 if the input is -8, then the output is

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Oliver had $50 on the day before his birthday. after he recived some money for his birthday , he had $75. write and solve eqaution to find how much money oliver received for his birthday. x+50=75