Pls help me with #18 it has to be in simplest form 10 points

Sketch the vector field vector f( vector r ) = 8vector r in the xy-plane. select all that apply. the length of each vector is 8. the lengths of the vectors decrease as you move away from the origin. all the vectors point away from the origin. all the vectors point in the same direction. all the vectors point towards the origin. the lengths of the vectors increase as you move away from the origin.

Given abc find the values of x and y. in your final answer, include all of your calculations.

Solve the system of equations. x=-2y+1 and x+2y=9. show work