What is the slope? I need help plz

The vertices of a triangle are a(7,5), b(4,2), c(9,2). what is m

Find the domain of the following expression: 1/(√x)-2

Choose the equation below that represents the line that passes through the point (2, 4) and has a slope of 3. a) y − 4 = 3(x − 2) b) y − 2 = 3(x − 4) c) y + 4 = 3(x + 2) d) y + 2 = 3(x + 4)