Find equation of the line passing through x (1, 1) and Y (5,5)

Pls help

What is the greatest common factor of 6a, 8a^{2}, and 14?

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?

What is the equation of a line that passes through points (0, 4) and (-4,-8)?