2x-1=y,

2y-4x=7 is the equation are parallel show break down

Y = 2x - 1 ... slope here is 2 and y int is - 1

2y - 4x = 7

2y = 4x + 7

y = (4/2) x + 7/2

y = 2x + 7/2 ... slope here is 2 and y int is 7/2

When the slopes of the lines are the same, and the y intercepts different ... this means they are parallel lines