What measurement is the quantity of mass per unit volume?

Which equation represents the line that passes through the points and (4, 10) and (2, 7)? y = 3/2x - 11y = 3/2x +4y = - 3/2x + 19y = - 3/2x + 16

In the diagram of circle a what is m

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?