Evaluate a+4 when a=7 but how do you do it doe?

If 90° < θ < 180° and cotθ = -1/3, then cscθ =

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

What is the measure of angle x? answer