What is the value of 2y+3,when y=4?

How can you decide witch operations to use to slice a two step equation

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

Factor the expression using the gcf. the expression 21m−49n factored using the gcf