ACT Math : How to find out if lines are parallel
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Example Questions
Example Question #21 : Coordinate Geometry
Which of the following lines is parallel to:
First write the equation in slope intercept form. Add 
Example Question #22 : Coordinate Geometry
Which pair of linear equations represent parallel lines?
Parallel lines will always have equal slopes. The slope can be found quickly by observing the equation in slope-intercept form and seeing which number falls in the "
We are looking for an answer choice in which both equations have the same
Example Question #23 : Coordinate Geometry
Which of the following equations represents a line that is parallel to the line represented by the equation 
Lines are parallel when their slopes are the same.
First, we need to place the given equation in the slope-intercept form.
Because the given line has the slope of 
Example Question #46 : Lines
Line 
Yes, the lines are parallel with a slope of 
No, the lines are not parallel. Line 
Yes, the lines are parallel with a slope of 
No, the lines are not parallel. Line 
Yes, the lines are parallel with a slope of
Finding slope for these two lines is as easy as applying the slope formula to the points each line contains. We know that line 
Line 
The two lines have the same slope, 
Example Question #47 : Lines
Line 
No, the lines are not parallel. Line 
Yes, the lines are parallel, and both lines have slope 
Yes, the lines are parallel, and both lines have slope 
No, the lines are not parallel. Line 
No, the lines are not parallel. Line
We are told at the beginning of this problem that line 
Since we know that 
Thus, the slope of line 
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