Write an equation of the perpendicular bisector of the line segment whose endpoints are (-1,1) and (7,-5)

How do i do this activity, is appreciated

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36

What additional information could be used to prove abc =mqr using sas? check all that apply.