Hello everyone Help me please

What is the value of m in the equation 1/2 m - 3/4n=16 when n=8

An object in geometry with no width, length or height is a(n):

Aline passes through the points (5,4) and (2.1). part a.) what is the slope of the line that passes through these points? show work. part b.) what is the equation of the line that passes through these points. show work. part c.) where does the line intercept on the x& y axis? show work