Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Look at this expression. a3b3c a-3b-3c-1 which of the following is the simplest form of the expression above?

What is the value of x in the diagram below?

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