Question

write a equation of a line on which the point (a,a) lies

Answer 1

equation y = mx + c
where m= slope and c= intercept
(x,y)=(a,a)

then
a = m(a)+c
a(1-m)=c

Answer 2

general eq of line is y = mx + c
this pass through ( a,a )
=> a = ma + c
=> c = a(1-m)
=> eq of line is y = mx + a(1-m)
where m is slope of line