How do I use substitution to find the solution of the system of equations $y = - 2 x - 4$ $y=-2x-4$ and $y + 4 = - 2 x$ $y+4=-2x$ ?

Question

3828 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2014-10-25T01:27:39

[1] $y = - 2 x - 4$ $y = -2x - 4$
[2] $y + 4 = - 2 x$ $y + 4 = -2x$

If you isolate $y$ $y$ in [2], the resulting equation is equal to [1]

$y + 4 = - 2 x$ $y + 4 = -2x$
$\Rightarrow y = - 2 - 4$ $=> y = -2 - 4$

Since [1] is a linear equation, the domain is $RR$ . This means that any value of $x$ will yield the same valid value for both equations

How do I use substitution to find the solution of the system of equations y=-2x-4y=−2x−4y=-2x-4 and y+4=-2xy+4=−2xy+4=-2x?