Answer:
[tex]y=3x[/tex]
Step-by-step explanation:
[tex]Ax+By+C[/tex] ⇒ [tex]y=mx+b[/tex]
[tex]3x+y=0[/tex]
Since there are no coefficients on the [tex]y[/tex], you can convert the equation in one step.
Subtract [tex]3x[/tex] from both sides
[tex]y=3x+0[/tex] [tex]or[/tex] [tex]y=3x[/tex]
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