Ineed to answer 1-10 and do not understand. they are conversions and double conversions. this is math and i have a test

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

How many solutions does the nonlinear system of equations graphed below have?

Having a hard time understanding this question (see attachment).