According to the system of equations above, what is the value of x? All right, whenever they ask you to solve for a variable, given two systems of equations, what you should do is isolate one of the variables, take that value and plug it into the second equation. So let's do that. So for the first equation, we can isolate either x or y. For this, for this show, I'm going to just isolate for y, okay, and I'm going to plug in that value for y into the second equation. So y is equal to negative nine minus x.

And if I plug this into the second one, I will get x plus two times negative nine minus x is equal to negative 25. All right, now if I multiply the two throughout, I will get x plus negative 18 minus two x is equal to negative 25. that'll just be x minus 18 minus two x equal to negative 25. And moving on here, if I combine the x terms, and I add 18 to each side, I will get negative x is equal to negative seven because negative 25 plus 18 is negative seven, and that just gives us an x equal to seven