Two lines are parallel if and only if they have the same gradient (slope). In this example, since both line A and line B have a gradient of -3, they are parallel to each other.
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How to Determine if the lines are parallel Part 4本站添加:
So, for question number four, we have the gradient of line A is -3 and the gradient of line B is -3 as well. Let me write this down. So, we know that the gradient of line A is equal to -3 and the gradient of line B is equal to -3.
So, this means that m A is equal to m B. So, they have the same gradient. So, therefore line A is parallel to line B.
There you go.
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