Help me with this please

An an average person has 6×10 by the power of two as many red blood cells as white blood cells a small sample of the blood has 7×10 by the power of three white blood cells about how many red blood cells are in the sample

Find the values of y: 3y^3(y^2+ 2/3y)=0

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15