Please help with that​

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11

This is about circle theorems. someone asap : (

Justin has 750 more than eva and eva has 12 less than justin together they have a total of 63 how much money did