Question

What is the slope of the line that passes through the points (4, 7) (4,7) and (5, 8) (5,8)?

Answer 1

$y = m(x) + b$
Where m is slope
Plug this in equation
Solve for one of the unknown variables and then plug this into the next equation.
Find m.
$7 = m(4) + b \\ b = 7 - 4m$
$8 = m(5) + 7 - 4m \\ 1 = 5m - 4m \\ m = 1$