Find the value of x that makes A||B. L2=3x-20 and L5=x+20 x = [?]

Please, I really need help. Thanks! :)

What properties allow transformation to be used as a problem solving tool

Ihave trouble finding the nth term of a linear sequence

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