Question 1174624
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y = mx + b is the slope-intercept form of a line

m is the slope (the amount of rise divided by the amount of run, also known as (change in y) / (change in x))
b is the y-intercept (where the line crosses the y-axis, i.e. the y value you get when x=0)

Parallel lines have equal slope.

Using the point-slope form, y-y0 = m(x-x0) with m=2, (x0,y0) = (5,-1): 
y - (-1) = 2(x - 5)   << point-slope form of the parallel line
y + 1 = 2x - 10  
  y = 2x - 11     << slope-intercept form of the parallel line