# How do you decide whether the graphs of the two equations are parallel lines: #y=2x-1, y=-2x+1#?

##### 2 Answers

Dec 5, 2016

Not parallel

#### Explanation:

Lines are parallel, if their slope is same.

Slope of y= 2x-1 is 2

Slope of y= -2x+1 is -2.

The slopes are not same (not equal), hence lines are not parallel

Dec 5, 2016

Both lines are expressed in slope intercept form

To be parallel they would have to have the same slope. This is not the case so they are not parallel.

#### Explanation:

More in detail if the two lines

were parallel, then

But:

and it is also obvious that the two lines cross for