I now have a new question, but I'm really confused so please help me out if you can!

Answer:
[tex]y=\frac{4}{7}x+5[/tex]
Step-by-step explanation:
The gradient of line A is
[tex]\frac{3-(-1)}{7-0}=\frac{4}{7}[/tex]
Parallel lines have the same gradient, so m = 4/7.
Substituting the coordinates of P into y = mx + c,
[tex]5=c \implies y=\frac{4}{7}x+5[/tex]