Pls help I’m desperate

And it’s almost due

Which of these tables represents a non-linear function?

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

To decrease an amount by 16% what single multiplier would you use