PLEASE IM FAILING MATH

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 .

Does anyone know how to do geometryme with this problem

Write an equation of the line that passes through 9,2 and is parallel to the line y=5/3x+9