how to determine if two lines are parallel without graphing them

You are given the equations of two lines and asked to determine if the lines are parallel. Without graphing the lines, how could you determine that?

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1 Answer

it the formula y=mx+b, m is the slope. Lines are parallel when they have the same slope.

For example: these lines are parallel:

y=5x+7

y=5x-4
by Level 8 User (35.3k points)

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