Find y

Find y:

Use basic algebra to solve to solve for unknowns.
Hint 2
Use substitution to first solve for $$x$$ .
Looking at the three equations, the variable $$x$$ appears every time, meaning we should describe both the $$y$$ and $$z$$ variables in terms of $$x$$ . Analyzing the second equation:
$$$x+z=0\rightarrow z=-x$$$
Analyzing the third equation:
$$$x-y=-5\rightarrow y=x+5$$$
Substituting the new equations into the original first equation:
Solving for $$x$$ :
Since we now only have one unknown variable, we can solve for $$y$$ using the third equation: