Please help! also show some work so i know its correct thanks!

If lmn=xyz, which congruences are true by cpctc? check all that apply

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

What percent of 18 is 24? and plz explain thx.