I need help pls help help

What is 20+(5 x 2/5 )+ 3 show your work

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

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