Question

The endpoints of JK are J(–25, 10) and K(5, –20). What is the y-coordinate of point L, which divides JK into a 7:3 ratio?

Answer 1

Use a parameter t = 7/(7+3) = 7/10 from J toward K. The y-coordinate is
y = 10 + (7/10)(-20 − 10) = 10 + (7/10)(-30) = 10 − 21 = −11.

So y = −11.