Line $s$ is perpendicular to line $t$ in the xy-plane. Line $s$ passe…

Question

Prompt

Line

s

is perpendicular to line

t

in the xy-plane. Line

s

passes through the points

(6, 7/8)

and

(- 3, - 17/8)

. Line

t

passes through the points

(- 8, 39)

and

(k, 78)

. What is the value of

k