The equation y = 0.25x describes proportional relationship between x and y. what is the constant of proportionality?

Polygon mnopq is dilated by a scale factor of 0.8 with the origin as the center of dilation, resulting in the image m′n′o′p′q′. the coordinates of point m are (2, 4), and the coordinates of point n are (3, 5). the slope of is .

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10