y=2x-7
An equation of the line that is parallel to y=2x-7 means that the slope stays the same. In this case, in your new equation, 2x stays the same.
y=2x+b
Using this, you plug in the points given, (-3,6).
y=6, x=-3
6=(2*-3) + b
6=-6+b
b=12
Therefore, your final equation that's parallel to y=2x-7 is y=2x+12