How do you know when to lines are parallel or perpendicular without using a graph to see?
Hello! To check if two lines are parallel, you must calculate their slope, if their slope is the same with the same sign, then the slope is the same, it doesn’t matter what the y-intercept is. To see if two lines are perpendicular, multiply the respective slopes and they must equal to negative 1! Hope this helps! If you need help, just contact me!
