What is the remainder for the problem 4,231 / 13?

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

Answer pls man im trying to get out of summer school

The area of a circle is equal to 1 dm². find the radius of the circle.