Step 1 :Given the equations of the lines, we need to find which ones are parallel. Two lines are parallel if and only if their slopes are equal.
Step 2 :The slope of a line in the form \(y = mx + b\) is \(m\). For lines not in this form, we can rearrange them to this form to find the slope.
Step 3 :Rearranging the equations to the form \(y = mx + b\), we get: \[y = -3x + 10\], \[y = 0.4x - 8\], \[y = 2.5x - 8\], \[y = 0.4x - 6\], \[y = -3x - 50\]
Step 4 :The slopes of the lines are -3, 0.4, 2.5, 0.4, and -3 respectively.
Step 5 :Therefore, the lines with equations \(y = -3x + 10\) and \(y = -3x - 50\) are parallel to each other because they have the same slope.
Step 6 :\(\boxed{\text{The lines } y=-3 x+10 \text{ and } 6 x+2 y=-100 \text{ are parallel to each other.}}\)