Answer:
[tex]\huge\boxed{y=13+3x}[/tex]
Step-by-step explanation:
[tex]y-3x=13\\\\y-3x+3x=13+3x\\\\\boxed{y=13+3x}[/tex]
y = 3x+13
y-3x=13
Add 3x to each side
y-3x+3x=3x+13