Question

if P(4, a/4) is the midpoint of the line joining the points A(4,9) and B (4,-2). Then the value of a is

Answer 1

Explanation:

the value of a will be 14 I think so

Answer 2

Explanation:

Mid-point formula:

$p(x \: y) = ( \frac{x1 + x2}{2} \: \frac{y1 +y2}{2} )$

P(4,a/4)=(4+4/2, 9-2/2)

By equating only y-coordinates:

a/4=7/2

a=7(4)/2=14.

a=14.