Point b has coordinates (2,1). The x coordinate of point A is -7. The distance between point A and point B is 15 units. What are the possible coordinates of point A?

(-7 , -11) or (-7 , 13)

Step-by-step explanation:

15² = (2 - (-7))² + (1 - y)²

225 = 81 + 1 -2y + y²

y² -2y -143 = 0

(y + 11) (y - 13) = 0

y = -11 or y = 13

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.

1: -2 3/4, -2 1/2, -14, 0, 3, 8 1/3

2: -4, -3, -2 1/2, -2 1/4, 3 1/4,

step-by-step explanation: