I think you meant, "How do I find the equation of a line passing through the given point and parallel to the given equation?: (3,4) and y = -(7/5)× -3
Two parallel lines have the same slope. The slope of the given line is -7/5.
The new line passes thru (3,4). Use the point-slope formula for a str. line:
y-4 = (-7/5)(x-3) (answer)
This could be written in other forms if desired, e. g., the slope-intercept form.