Remember that the slope intercept formula is:
y = mx + b
m is the slope
b is the y-intercept
so...
y = -3x + 5
If lines are parallel then they have the same slope (m)
This means that the slope of the line will be -3
y = -3x + b
Now we must find b
To do that you must plug in the point the line goes through in the x and y of the equation.
(0, 2)
2 = -3(0) + b
2 = 0 + b
2 = b
y = -3x + 2
Hope this helped!
~Just a girl in love with Shawn Mendes