8/27 simplified as an exponent

What is the equation of the graph below? y=sec(x)-4

What are the first 4 terms in the multiplication pattern given by the formula 2×4n

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