Help me with my homework please

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

Which value of m will create a system of parallel lines with no solution? y= mx - 6 8x - 4y = 12

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.