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2 cards from this section. Quick, good the night before a test.
Are lines with gradients 5 and 5 parallel?
Look for equal gradients.
If line 1 has a gradient of 1, what is the gradient of a line perpendicular to it?
What do we multiply by to get -1?
What is the condition for two lines to be parallel?
Focus on the relationship between the slopes.
True or False: Perpendicular lines have the same gradient.
Consider the definition of perpendicular lines.
Prove that lines with gradients 4 and -1/4 are perpendicular.
Remember to check their product.
If a line has a gradient of -2, what gradient must a perpendicular line have?
Think about how to find the opposite slope.
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