### Home > CAAC > Chapter 7 > Lesson 7.3.4 > Problem 7-114

7-114.

Substitute the slope and the points into the point slope formula.

*y* − *k* = *m*(*x* − *h*)

Substitute the slope (0 for a horizontal line) and the points into the point slope formula.

*y* + 11 = 0(*x* − 8)*y* − *k* = *m*(*x* − *h*)*y *+ 11 = 0 *y* = −11

See parts (a) and (b) to solve. Remember that perpendicular lines have opposite reciprocal slopes.