214512154515454521545*4515546254-28 452548554/515252845262-28482+284825 425784541=5485152x+465555595656

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

Ill mark the brainliest if you me with the these three questions 7,8,9

To solve the system of equations below, pedro isolated the variable y in the first equation and then substituted it into the second equation. what was the resulting equation? { 5y=10x {x^2+y^2=36