How to do these problems

Two different linear functions are shown below with two points given from each function. use slope-intercept form or point-slope form to find the equation of each. linear function a points: (–5, –2), (–5, 7) linear function b points: (7, –5), (–2, –5) function a has: the equation of line a is: function b has: the equation of line b is:

Can someone me with my hwplz(only the circled ones)

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3