How can i change the subject of this formula in algebra please

Im really confused on what to do, these are the equations:

Y = 2x + 4

5 = 2x -3y

Thanks :) x

2*x = y - 4

x = (y - 4)/2 = (1/2)*y - 2

2*x = 5 + 3*y

x = (3/2)*x + 5/2

3*y = 2*x - 5

y = (2/3)*x - 5/3

I believe what you are asking is how do you combine the two equations into one. To do that, substitue the first equation into the y variable of the second equation. 5=2x-3(2x+4) which translates to 5=2x-6x-12. Break this down further to 17=-4x and finally solve for x. x=-4.25